Those things were always so expensive, even used for years after, and now hard to even find. I remember wanting one back in the day when I was running Gentoo on my old 500Mhz PowerBook G3. So loud though...
They are not that hard to find on eBay. Unfortunately, here in Europe they are quite rare, but I bet that, in the US, there are abandoned warehouses full of these.
Today we have Raptor Computing's stuff instead.
https://secure.raptorcs.com/content/TL2WK2/purchase.html