Reseller supporting purchase orders?

I need to find a reseller that accepts purchase orders from a school or other business....and has the Abit NF7-S rev 2.0 in stock or the Asus A7N8X deluxe.....i want either of these motherboards and altho www.tigerdirect.com supports purchase orders...they don't have either mobo...

where can i find a site like this?

anybody?