This is the Walmart sight for the gift card exchange. Not sure if they do Dick's but they claim to accept over 200 cards. I believe the Amazon cards get the biggest percentage back. The are paying between 70% to 96% on the dollar depending on who is the issuer.
If you don't get any offers and decide you'll set it for $30 I'll buy it. I would just go find something to buy if I were you. I'm sure there's something in there that you can blow it on. I'm in Cantonment if you decide otherwise.
Dicks is right at the mall in Pensacola (connected to the mall actually). I see 40.00 being fair since it is a extra 10.00. That is an extra pack of soft plastics or even a mirrolure plus whatever is close to that.