Devilman, devilman /Rob Zombie
Anyway, I wouldn't count on two of them working, but one would be feasable. Because when it first rings up, it'll be for $20, right? Isn't the discount only applied when they bring up the total, AFTER you input the GGC? If so, then it should be pretty easy to get two for $20, since I doubt many cashiers would care enough about it to go back and re-scan in everything and refuse to let you use the GGC the second time they scan it in. Although this is assuming that the GGC works in conjunction with the sale, when they fixed the multiple-item exploit a few weeks ago they may have also locked out the GGC in combination with other deals.