Palm Treo 680 available for pre-order on Amazon for $413, with a shipment time of 1-2 weeks. Before we could finish getting this post up, however, the item switched to “not available” on the website, something fairly telling.

It’s worthy to note that the version Amazon had ready for you when it was a pre-order item was the unlocked GSM version, not the all-but-official Cingular version, which means $413 is most likely the bulk price per-unit. This gives us some clues as to what Cingy will be able to do with subsidies, and makes the idea of a really cheap (or even free) Treo that much more realistic.

Treo 680 on Amazon [Amazon product page]