what's your budget? A 30 to 36 sniper will run circles around a standard 10x36 inch sluice. Without classifying so less gear to carry. There are numerous places around us that have ample flow. I don't know how much material you normally run. But, if you hit a spot with a sniper and stockpiled four buckets of material you want to run, again no classifying...its gonna take you maybe 20 minutes to run...MAYBE...sub 200.00 for a sluice minus the need to classify is a great deal.
You never said what size you wanted. If you want a prospector there are a few under 200.00. Those are a bucket a minute sluices when running well and even at less than perfect conditions run serious material. As mentioned above it is going to be a while before you luck into one used. and something to note we have seen them seen used sold for full retail...and even at a premium!!