Dollar stores are a cachers best friend!
I just picked up some "Shark Tails" 100 piece jigsaw puzzles the other day from Dollar Tree. The kids will probably snatch them right up. The 500 piece "scenery" puzzles are popular with adults also. I usually put them in my 50 cal. cans where ther is more room.
DVD's, tools, playing cards, kids card games, & flashlights are very popular trade items around here.
Oriental Trading Company is another good source for trade items at reasonable prices.
I wonder if the dollar store employees are aware of geocaching and how much business it brings in??