My understanding is that the Radio Shack detectors are Bounty Hunters. In fact, one of them is actually listed as BH. Discovery is their line.
Walmart is selling BH detectors also. Pioneer 202 and Pioneer 505 are a couple models, in the middle of the line. There are a few other models also.
I have to say, I don't know anything about Bounty Hunter or, any of these models. Maybe someone can give you a little more information before you put your money down on one.
A few things I would suggest though.
Do not go with the cheapest most basic detectors. Those are usually a step above toys, intended, probably, for young children. Some, seriously and literally are toys. Go with one of the more upper level ones. You don't want to spend $70 to $100 and find that the detector doesn't satisfy your needs or is so cheaply made that it will snap in half the first time out. Better detectors offer a better selection of features like discrimination, depth readings, programs for different types of hunting... Also, they are built to withstand weather, moisture... and have stronger shafts etc., designed to withstand a lot of serious detecting. Many of the good detectors that I read about here. Whites Prizm II is about $200 and the Prizm III is about $300. Garrett Ace 250, which is highly recommended here, is about $200 also. There is the BH 202 listed at RS for $198

Compare that one with these others and see how it might be equipped.
If you are looking at Radio Shack or Walmart because you can walk in and then, maybe, out with your detector, try going to a local sporting goods store, instead, and see if they stock them. Depending on what stores might be in your area, Dick's Sporting Goods (Minelab, Garrett (Ace250 available), Bounty Hunter), Bass Pro Shops (Bounty Hunter), Sports Authority (Minelab, Garrett (Ace250 available), Bounty Hunter), Bass Pro Shops (Bounty Hunter), Cabelas (Bounty Hunter and a couple called Technetics) and, perhaps other large outlets, list them online. Whether they stock them in their stores, is another question. Incidentally, Sports Authoritie's website, and Dick's Website seem awefully similar. Did SA buy Dicks out

??
Also, go to
www.whiteselectronics.com and in the box indicated, insert your zip code. They will tell you if there is a Treasure Hunting or other store in your area that sells White's Detectors. I have a White's XLT which is probably over your budget but there are other detectors in their line that might fit your resources. Prizm is a line of them to look at. I have been thinking of a second detector and, while the ACE 250 by Garretts is high on my list, some on these boards suggested the White's Prizms as well. There is a $50 rebate going right now, I think, instant at time of purchase. That is somewhat attractive along with my experience and satisfaction with Whites to begin with. Most of the other detector manufacturers offer the same ability to put in your zip code or address and find a dealer near you.
Many of these dealers might be smaller shops that you don't know are there. Also, they might cost a little more but you might find it more interesting and you might be happier with the customer service that you get for your money. Look in your phone book or check the manufacturers online. These places exist but you might need to look a little to find them. I bought my White's XLT from a store, don't recall the name, down in Chicago on Milwaukee Av. It was a small shop and wasn't glitzy or anything. Was a place with the detectors for searching utilities, lined up on the floor in the front. The store seemed old and had the air of one of those small shops, from years gone by, where you might take a vaccum or TV to get it repaired. There was a work bench in view where the proprietor was, obviously, servicing these other utility locator machines. I almost walked out thinking this wasn't the right place. Then I noticed the small display of Whites boxes and brochures. But, as I got talking to the guy, he told me of much of his experience searching area beaches and such and tipped me off on the local clubs.... He gave me a decen't enough price and, more customer service than I could ever get online or at a Walmart. The other place, in my area where I have been, about 20 mi north of me, is a small shop in the back of an industrial park. Behind some warehouse buildings and such. I thought I was lost the first time I went there. Odd hours also. Open later in the evenings but not mornings etc. Went back there in the evening and the whole area was dead. Just seemed odd that something would be back there at that time of the evening. When we went inside, there were display cases full of detecting finds, scoops and shovels and detectors on display. Again, it wasn't your most elaborate retailer but the man there started telling us some of the hot spots in the area and in Southern Wisconsin where they had been finding some prime stuff. I went in to buy a digger and a scoop. Bought them right away but stood there for almost 45 minutes talking about the local clubs and hunting spots, permits required in Lake County Forest Preserves

. My girlfriends eyes were starting to roll as I stood there talking to the guy. God, I fell in love with such a geek!!! Again, the customer service and help that I got from these two guys far outweighed the huge stores and fancy displays....
You might find yourself much happier if you go for a higher end detector to start with than getting something too basic that won't find you much or will break as soon as you dip the coil into some strong waves on the beach, or that, simply doesn't have the features that you want and need. You might also find it more valuable, especially to start, to have someone you can go talk to about local places to search, some of the restricted areas, places to keep away from or places to definately go search. Also, if you have trouble operating the detector, it could be good to have someone to go to for help. One of the things, at least one of the guys had, was a test garden where he had burried some stuff. He said if I had any troubles, to bring the machine in and he would take me out and show me how things worked.
Again, not saying you need to go $800 like mine, or even $600 or $500. But, there are several good machines at or under $300 or $200 that you might do much better with. Compared to the RS and low Walmart machines at $70 to $100, If it means saving for another month or two to swing it, I would do that.
Good Luck and Happy Hunting.