Asus officially announced the Asus Eee PC 900 with the 8.9 inch screen mid-April. The Asus Eee PC 900 is supposed to ship on May 12th in the United States. If you cannot wait that long, the Asus Eee 900 is readily available on eBay.
Mostly Asian eBay merchants based in Hong Kong or Taiwan ship the new Asus 900 world-wide. The price is between $600 and $700. The MSRP for the Asus Eee PC is set at $549.
Some offers have hefty shipping costs, so be sure to compare.
More details on eBay.