Rob, are these PCI or ISA sound cards?
If so, I think you are paying too much for each. Approx weight for one board, with the metal bracket attached,
4 ozs. Times that by 4 = 1lb
So, if u only buy at $1/card = $4/lb
Two of the major forum buyers are only paying out between $2.50 to 3.25/lb. Add shipping and you are losing
money :-( Hope my calculator is correct, lol.

btw, there isn't much one can 'refurbish' on a non functioning sound card. However IF some are high end cards
with lots of bells and whistle functions, they may be worth more than scrap to some E-bayers. (ebay = hassle)

Cheers and good luck