Here are the prices as listed through the Dennison store. Looks like you can (pre)order the unit now.

The unit(s) themselves are all the same price and available in silver and black. $ 359.99

Satellite remote display - $89.99

Hard drives:
20GB - $69.99
80GB - $149.00
120GB - $199.00

CD Changer emulator - $69.99

Tuner - $59.00

USB2 adapter - $89.00