I've gotten some from http://www.upgradeability.com before, prices are a bit varied but they've usually got a good stock.
Check out their eBay auctions as well, username: "upgradeability". I've bought a few things from them (including the IDT WinChip2 in my I-opener), everything delivered quickly and in good condition.
If you don't see what you want, you can always contact them and find out more.
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