I got mine from:

http://www.integrontech.com/Nokia-N8...p/nok-n810.htm

They show them as still in stock (although I suspect they are running out since the price is higher than when I got mine). The only problem is that it's the UK model with the huge UK power plug. I emailed them prior to ordering and they threw in a US adapter for free. I don't know if that was because I emailed first or they just do that for all US addresses.

Welcome to the obsolete edge of Maemo.