I bought this on Groupon back in mid Nov. when it was $35 w/ code. It's just shipping now. Great deal but don't expect it to reach your home anytime soon.
Groupon is a hit and miss when buying there. Sometimes, you'll get it on time and sometimes, you won't. I recently got a refund because it was almost a month since I made a purchase on CoD Ghosts for the XBox One for $35. Got a bit impatient, refund given, and got a copy instead at Target after using the 30% coupon.
I'm guessing it took long for COD to ship because of the demand and low price. It was probably backordered after the first rush of orders were fulfilled and the rest of us had to wait for new stock to arrive.