The people who work in GW move fairly quickly. Sometimes it is a new person who is pricing them.
I've had two horrible instances in my local GWs. One store sold a jar for $319. For that price, there should be gold in it. JUNK! I called the manager, who told me they had a new girl doing the jar. I called cooperate to complain. I spoke with them for a long time. I don't go back to that GW, so I can't tell you if the jars are better or cheaper.
This week, I went to another one and they had a jar for $250. I spent 30-40 mins checking this jar out. My gut kept saying to leave it. There was some silver rings, and I thought I saw a gold chain ... which usually means there is a pendant on it. In the end I took it. JUNK! i seriously was going to go dump the whole lot in there and ask, WHAT IS WORTH $250

But I didn't. (I really should have!) Manager told me that they had a new girl doing them. I told him I have crossed them off my list and won't be buying jars there anymore.
The point is, so many times I have seen them over price things, and then people don't buy them. Then when that person moves on, they come back down again. Several of my GW stores have had this happen, where the jars shoot up, and then no one buys, and then they come down. I would call the manager and let them know that the books used to cost X amount of dollars, and now they cost Z. Good luck! Sometimes the managers just aren't aware what is going on in the back, which is crazy, cuz that is there job.