I really wish I used the Red Card, but because we fly so much and like our Disney Rewards a lot, our Southwest and Disney Visa are what we use daily and pay off weekly. Haven't paid for a flight in a couple years!
I figured if they wouldn't let me use the gc to buy the Disney ones (or iTunes gc when they're on sale is another great use) I would just use them for my next purchase and put that cash saved toward Disney gc.
For the pp - every week Target has specials like here this week they had this:
Buy two venus or gillette razors and get $5 target gc. I used two $4 off coupons for them so I paid out $14 after those and then still got the $5 card. Love it when they have the big baby sales incorporating gc! It's a huge benefit when you have coupons to pile on top (manufacturer & Target ones can build even more savings!)