If a bare root seedling will work you can try

http://stores.ebay.com/Polynesian-Produce-Stand/_i.html?_nkw=Quararibea+funebris&submit=Search&LH_TitleDesc=1&_sid=57666481

Or you can contact these people to get on their waiting list for seeds.

http://www.rareflora.com/store/index.php?main_page=contact_us

I hadn't heard of this plant before so thanks for the info on it! :)

thanks rcantor! I saw the seller on ebay and I think I'll give it another try even if in the winter they sent me some really tiny seedlings only one of which survived.. well, since it is a really rare tree..

Hello again,
happy to report I got a nice seedling last week and so far it looks good (in the plastic bag)!!Off to my next quest!