The chuck will be going on sale at woodcraft but I picked up one today from the Matthews store. I haven't watched them closely but I think that's a pretty good deal.
eBay: CENTRAL PNEUMATIC 92504 4 HP, 29 GALLON AIR COMPRESSOR (item 110053994303 end time Nov-14-06 12:50:17 PST)
Specs here:
Harbor Freight Tools - Quality Tools at the Lowest Prices
Granted, not the best compressor, but for the price....