I just scored a 17" Powerbook G4 running Leopard with the following specs off of eBay:

1.67 Ghz

100 GB HD

2 GB Ram

Superdrive

It also came with an AC Adapter and a nice carrying case.

Price: $272 with shipping (Probably too high, but I sold my Dell Laptop and needed a replacement).

I can't wait for it to come!