I have had my share of getting and disposing of pins this way, so one I can recommend is this one:
Dizpins Sale Board There are usually some grab bags somewhere on here, but the price differs from seller to seller. Can pay to check it out from time to time and see. Have a number of Sedesma lying around myself, which I tend to end up trading for whatever as they are considered lower-rung by most, though I think they still accept them as traders. Anyway, take a look and have fun. Hope you find some to work with.
TTFN.
Pooh