I have been very lucky with a couple of pawn shops.  A couple months ago, I got a nice looking set of war nickels (12 total) for $10.  At another small, junky pawn shop where my wife is from, I asked for his price on some silver and ended up having to make a very fast run to an ATM.  It was around last Christmas and I asked how much he wanted for a couple Walkers and silver quarters.  He said $7 each for the halves and $4 each for the quarters.  I bought all he had.  I went back later and pulled out about 6 40% halves from his box of random halves for $1 a piece.  Very good day for me.  That will be the first place I visit next time we go to my wife's parents place- sorry, inlaws.  

At  another place just a couple weeks ago, I picked up a few silver Canadian quarters for $2.50 each.  
You just never know.  I always go in and see if they have anything.  Usually, I come out empty handed, but every now and then...