Disclaimer: I receive a referral commission for the following link(s) and I greatly appreciate supporting the site: Amazon, eBay
Update - check to see if you have a 10% off coupon
Ok, so I really don't have time to post this, but it's also a good deal. You'll have to figure out everything yourself. Sorry, I don't usually do this.
eBay has the MacBook MD101LL/A 13" for $800 without tax everywhere except NJ. I sold it last week for $890 as new and it is still around that price on Amazon. Max of 2.
FBA fees (before shipping) bring down your takehome to about $825. Amazon could always say you can't sell as new which changes your profit margin.
eBay Bucks (2% right now), Inbox Dollars (or Top Cashback with a match to Inbox Dollars) for 5% ($40!), credit card rewards, eBay gift cards sweeten the deal.
Sorry, gotta run!