According to All Things D, best buy is to offer a trade-in program similar to their iPhone program from last month. The program will accept your iPad 2, and/or third-gen iPads in exchange for a gift card redeemable in their store or their website.
The only catches? You actually have to go into the store to do the trade-in, the program is only valid July 12 – 13, and not every Best Buy is partaking in the program. They have updated their iPad website to include a Find a trade-in store near you function so finding a location wont be too difficult.
This is a great time for you to update your old iPads for a cheaper price!