gogo open market
sets are very unreliable currencies to use, becasue they usually only depend on whether or not the person needs it that bad; also there are usually 1 hard peice and the rest are easy, this would also cause problems becasue usually people will only need the 1 hard peice
as a price guide, it can go something like this:
Ladder-Sc-UsWest
Mavs-Um
Tals-2um
Nats-Lem-pul
Ik-Um
Aldurs-Um
Trangs-Um pul
Griz-Pul
as for ss, ss would be about pul; but they are very easy to come by... some people will sell/give them away just to save room
and as for coa, lol good luck; maybe if you have about 2 of each set, you might get a very, very, very, very, very, very, very, crappy one...