Well Best Buy has a sale going on where you get a $25 dollar gift card when you purchase a Wii U and then through 12/28 you get a $15 dollar gift card, plus a free game (either Zombie U or Just Dance 2014, which you could probably sell for around 30-35 bucks on eBay). So basically you could get a $40 dollars in gift cards, which doesn't even include reward zone points you earned, then if you sold the game for about $35 bucks you would be getting a Wii U for about $225.
Too bad you missed out on the Wink Waker Bundle at Target for $250