Anyone looking to bulk up on MS Points, listen up: Buy.com (via its eBay outlet) is selling 4000 MS Point cards for $40 with free economy shipping. That's $10 off the usual price or, depending on how you look at it, 1000 MS Points for free. Act quickly, they're bound to sell out fast.
4000 MS Points
$50 $40 (Buy.com via eBay)