Amazon currently has the Makita MAC2400 Big Bore 2.5 HP Air Compressor: http://www.amazon.com/gp/product/B0001Q2VPK/ref=oss_product
for $232.49 with free super saver shipping. The next lowest price I have
found is about $350 with shipping.
I've had my eye on this air compressor for some time. It gets great reviews
, many of which say it is very quiet.