[quote name='Kendro']You'll sell it really close to value since you don't have to pay any tax when purchasing with GS store credit. Thought your 0 feedback might hurt you as well as the fact you just joined eBay yesterday. Good luck though.[/QUOTE]
I thought that was YMMV and depended on the state? I live in a state with no sales tax, so the card most definitely wouldn't be worth full value in cash to me. But I think I've bought games in other states with my Edge card and paid tax. I KNOW I've bought things with Blockbuster value cards and paid tax, but of course they operate in a "special" way.
In some states, though, they give you the tax on the trade-ins and thus charge you tax when you spend the money (I know BB does this in Virginia, anyway).
In any case, for the OP - I wouldn't expect to get the full value for the card. It is more reasonable, for someone to tie up cash into store credit + the (very small) risk of buying stuff off ebay, that you would get 75-80% of the value. It will be interesting to see how it ends up. You were good to post it here as you might get CAG's willing to take more of a chance than random ebayers (given your zero feedback new ebay account).
As for shipping, if you get a PayPal payment with a confirmed address, be sure to use delivery confirmation as others have noted. Then you are covered (in PayPal's eyes) if the claim it never arrived (but the DC shows it did). Also, to be safe, xerox the card before you mail it. I sent a Blockbuster value card to a CAG for trade and it truly did get lost (for a while). I was able to use the xerox to get the money put on a new card which I then sent him (have no idea how EB would handle such a thing but it can't hurt to have a copy). Of course, the old card showed up a few days after the new one (and about 3-4 weeks after I mailed it!).