I'll take a stab.
$40: because that's the lowest priced one I see on newegg. Didn't need to check the specs about discrete graphics support because they all do nowadays. I don't even know if it's possible to buy a motherboard without at least one PCIEX16 slot for a graphics card.
EDIT: I was wrong. This tiny, little thing is stuck with only a PCIEX1 slot.