Newegg has the AH340-U2T1H Acer Easystore Windows Home Server: http://www.newegg.com/Product/Product.aspx?Item=N82E16859321014
with 2TB drive installed in one of the four available bays for $299.99 and
free shipping.
Rest of specs are Intel Atom 1.6Ghz, 2GB DDR2 RAM, 2TB HDD, GBLAN, 4 Bay
Hotswap, Windows Home Server OS.
Lowest price on Google Products is $399 (and that was Newegg's own prior
price) - recently this server was being sold refurbished for $299 at
revonate: http://shop.revonate.com/Acer_Aspire_easyStore_H340_U2T1H_Tower_Server_p/l-pg.t170w.022.htm
and was considered a deal by some (currently sold out) - Newegg's is brand
new.
