Need advice on finishing sets.

I have several unfinished base card sets in football and baseball, does anyone know where I can pick up base cards for a reasonable price? I found a seller on the Beckett Buy, Sell, Trade site that didn't seem to bad, but I would like to know if anyone has other sources.
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email bcmiller7@comcast.net
A's World Championships-1910, 1911, 1913, 1929, 1930, 1972, 1973, 1974, 1989
Looking for 81-84 Topps Stickers in PSA 9 or better, 81 Topps Scratch offs, 83 Topps Fold outs in PSA 8 or better, 83 Fleer Stamps and 81/86 Fleer Star Stickers in PSA 9 or better.
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thanks