And notice that the subscriptions prices can be significantly different.
For instance, a year's subscription to Trains is $42.95 at magazines.com (25 pts/$), but $29.95 at MagazineLine (14 pts/$).
Also, I've never had great luck getting points to post from AGR Mall purchases. I eventually decided to only order when the price itself was good, and not actually expect to get points. It might be different now, but we'll see.