Cheap yes, but you will also have to exercise your brain a bit. Common sense isn't it...? If it's too good to be true, then it probably is...

My advice is, if you wanna buy cheap ACPP, be sure you get the box as well, in case Apple questions the legitimacy of your agreement, you get to show them at least the enrollment number as well as the serial number (to your ACPP box, not your machine), in case something screws up.

Better still, but directly from Apple Retail/Reseller...