Using a couple of empty juice boxes, a pair of scissors and a stapler you can fashion a simple holder for any size magazine. I'm going to demonstrate with my back issues of Make: magazine.
Step 1: Cut open your boxes
Start by cutting the wings off the top then cut the whole top off.
Next cut down one side (the narrow side) of each box but don't cut it off at the bottom.
Step 2: Start to size your holder
Step 3: Add the front
Then slip the base into the upright and push it back until it is snug with the front of the magazines.
Take one or two of the magazines out so that you can slip the stapler into the side and snap the first holding staple in. Repeat at the other side.
Staple the folded over tongue of the base to the sticking out tongue of the upright with a couple of staples.