I made one a little while back, and it maybe cost me $10. I just used a 3/4" piece of plywood that I had that was cut to roughly 12" x 24". I painted it black, added tome metal feet on the bottom to raise it off the ground about a half inch and put some drawer handels in each side. Threw on some industrial strength velcro and I was done. I'm about to outgrow it though, so I'm thinking about something like what was in the first link 6strngs showed. I'll try to remember to take some pics of my board when I get home, but you can kindof get an idea what it looks like in this pic >here<