There is an A2-300 currently for sale on eBay, I think the buy it now price is something like $250 (shipping is $60). It sounds like the owner has glued a couple pieces down to prevent rattling, but other than that and some scratches to the cabinet appears in reasonable shape. I have had an eD sub in my car for about 6 or 7 years now, great sub and a shame the company closed.
Edit: Shipping is now $85!! They have put to make an offer though, but no actual best offer button.