At the moment the price is only $49 (compared to AT&T after rebate price of $199).
There is NO rebate required for the Amazon price. It's worth noting that T-Mobile's 8900 also started on Amazon at $49 before eventually settling back to zero.
Amazon shows a 4 to 6 week wait - which seems to be their standard time for stuff they don't yet have in stock. This status changes quickly and their pricing on this item may also fluctuate as they take more orders. If you want one - the $49 price isn't bad. Amazon.com: BlackBerry Curve 8900 Phone, Black (AT&T): Cell Phones & Service