http://cgi.ebay.com/Sonnet-BG3-400-512-Crescendo-L2-G3-Mac-Processor-Card-/380308799315?pt=LH_DefaultDomain_0&hash=item588c2bbf53

No relationship or knowledge of the seller. I was searching for one for myself and found this seller with ten+ and the price seems good to me, so I figured someone here would probably be interested.

On the down side, it's only 512KB cache. On the bright side, the L2 upgrades seem pretty hard to find at all any more.