Rebates from eBuyer.com, PC Mall, Mac Mall, PC Mall Gov, Wareforce, eCost, Buy.com, Newegg.com, Elinux, CCITI, Club Mac, shipitforyou.com, Amazon.com, TigerDirect, Staples.com, Computers4sure.com, Global Computer Supplies, Dartek, zipzoomfly.com, Insight Direct and Dell
Some of those sites...