My brother just signed up for the Mypoints Mastercard. There is a small yearly fee, I don't remember how much it is. But, he got 1200 points for signing up, and then gets 1 point per dollar spend.
I believe the AF is now 19.95. Depending on your spending volume, you could easily make that up.
The Amazon one from the same company I don't believe has a fee. However, you are then limited to redeeming at Amazon but I believe they are a stackable GC.