What do you all use to back your custom heroes? I'd love to use that heavy stock that Flying Frog has but no clue where to start.
If you have a Hobby Lobby near you back in the section near the full sheets of matting they also have sheets of varying thickness of cardboard. They're something like $4-$5 for a huge sheet (3'x4'?).
After pasting to the cardboard/matting I use a rotary cutter to separate the pasted section from the larger sheets and use an 8 1/2" x 11" rotary trimmer to get nice edges.