Sign up for yardsellr. www.yardsellr.com. Sign up for an account. You get 500,000 "photons". This is equal to $5. Buy a silver dime (the coins on this site are expensive.) for $4.75. You have to pay a "buyers fee" of $1. The 475,000 photons will be used, all you have to pay is $1 (and that covers shipping). I just got a silver rosie for a buck.
I got a silver quarter for 25 cents yesterday by...searching through rolls of quarters. You can do the same with dimes and get them for 10 cents.
Cheap half-dollars I know how we all love to hate Littleton, but I still get catalogs from them. The last one had an offer to join the "20th Century Half Dollar Club. They will send you a Walking Lib, Franklin and 1964 Kennedy for $19.99 plus shipping, handling and delivery charge. Might not be a bad deal (you can cancel the membership at any time). If you decide to try, the number given was 1-800-645-3122.