Tiff refered me to an excellent store on Ebay! They have a lot of really nice proof sets there, and they are VERY nicely priced. I just ordered two proof sets today! I got a 1971 and a 1983 proof set! For only $5 each!!!
Here's a link to each one!
The 1971: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewI...AMEWA%3AIT&rd=1
The 1983: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewI...AMEWA%3AIT&rd=1