LOGIC Supply specializes in small, silent and stylish computer systems. They have a nice EPIA Matrix that compares various EPIA boards and a
accupc also carries VIA products with good prices & shipping.
Monarch Computer Systems is in Atlanta so no shipping. The web site doesn't list all the EPIA stuff they have - for example they have the M6000 in stock for $120. The EPIA 5000 is cheap at $99.
Monarch also sells the nicest case for miniITX I've found so far. The Casetronic C134 for $155. eWiz has priceing for it too. That's a picture of it on the left. It's the same size as my external 5.25" Firewire enclosure! A review of it can be found here.