[Poshua]

I think your girlfriend is off base here. CL Buyers tend to know the new-product price for the item they're seeking; they're only shopping on CL because they want to save off the new price. I think the key opportunity for CL arbitrage comes from uninformed sellers, not uninformed buyers; occasionally, all a seller knows is that they don't want the thing they have anymore.

I wanted to go see Lewis Black at the Borgata this August. The show was sold out and tickets were selling through agents at 2x face value or more. I picked up four on CL at face value, resold two over EBay at 1.9x face value, and kept two for personal use at almost no net cost.

So, OP, clearly what you should be doing is buying this TV over CL, not selling it.