Somebody from the old IRC channel has the 840AV version of a RAM card that used 8 x 72 pin SIMMs (32MB max each for 256MB total). I think Newer technology sold it. It was pretty fast for a scratch disk used by apps like Photoshop, wish I had one at the price he got it for ($15 I think).

Last one I seen on ebay (years ago) must have gone for $200, way more then I want to pay for one. I have quite a few Nubus cards in the collection but no RAM cards.