Engadget just reported that Archos started the pre-order of Archos 604 and 404 on their shop. A quick search on Amazon.com reveals that the new Archos 604, 404 and also the 504 with 160GB are available for pre-order at better prices than the Archos shop offers.

When Archos officially announced the 404 and 604 they did not announce details of the 504. Amazon.com is listing three 504 with 40GB, 80GB and the monster 160GB models. The description does not reveal anything specific about the 504. There is also no photo.

All new Archos PMPs ship already September 1st. See the list of all offers below.
All new Archos Pre-order Deals on Amazon.com:
Archos 504 40 GB Digital Media Player and Recorder - $329.99
Archos 504 160 GB Digital Media Player and Recorder - $549.99
Archos 504 80 GB Digital Media Player and Recorder - $359.99
Archos 604 30 GB Digital Media Player and Recorder -$329.99
Archos 604 30 GB WiFi-Enabled Digital Media Player and Recorder - $399.99
Archos 404 30 GB Digital Media Player - $279.99
Archos 404 30 GB Digital Media Player with Camcorder - $329.99
Archos DVR Docking Station for Archos 404, 504 and 604 Digital Media Players - $89.99