From the most recent edition of Gamestop's email newsletter for October 9th:
Limited PlayStation 3 Pre-order
GameStop and EB Games will begin accepting limited pre-orders for the PlayStation 3 console on Tuesday, October 10, on a first come, first served basis. Due to extremely limited supply, we expect to deplete this allocation very quickly, most likely in minutes. We will not accept additional pre-orders at this time. To avoid an unnecessary trip we strongly recommend you call your local store to determine availability. A $100 reservation deposit is required, which can be funded with cash, credit or trade. As we cannot control production and shipping issues by the manufacturer, a reservation deposit does not guarantee receipt of a system available to purchase at launch. Reservations/Purchases are limited to 1 per household.
Our limited online pre-order program will be announced at a later date, after software and accessory availability dates are confirmed. Online product pricing and availability will vary and will be fulfilled independent of store reservations.