What do you mean by "all in one"? Are you thinking SFF or something like that?
If you're just looking for a combo deal with a CPU and motherboard, Fry's has some pretty cheap combo deals using mostly ECS boards. Donno if PA has any Fry's stores though... If not, their on-line outlet is outpost.com. I've never mail ordered from them so I don't know if they offer the same deals on line.