A good website is coinflation.com. Here you can find the melt value of your coins and see which have silver. I go for the quarters lot because they are easiest to keep track of and seem most in my price range. If you do it right, you can get a lot for less than $3.00 a coin. I think the value is close to $3.10. I just missed winning a lot of 100 coins (pre-1965) for $275. (shipping included). As always the more you buy, the cheaper the product seems to get. Except for nickels, 1964 is the cut off date for silver, but don't bother buying rolls at the bank. They have been gone through already.
You can sometimes find coin collections at estate sales or possibly find them at a small town bank, but I think highly unlikely.
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