I've been following used D30's and Kodak DCS 520's on Ebay for quite some time now and couldn't notice any recent dramatic price drops.
The prices CDS quoted are actually quite good for D 30 bodies in good condition. The old clumsy 1.3 - 2 MP Kodak DCS cameras (AP 2000) based on Nikon system seem to have levelled out at about 250 - 350 USD some time ago now, the 2 MP DCS 520 based on the Canon EOS 1 sells for about 500 USD ... you won't be able to get a 3 MP DSLR any cheaper.
I also don't think that new entries in the 6 MP or above category (DRebel, D70) are going to bring that price *much* down in the near future.
But that's just my 2 (Euro)Cents...
Regards,
Andy