I think they are just a black dry erase board with neon markers that have a black light over the top of them.
Yep, and UV reactive ink in the pens. You can build that pretty easily if you can find black dry erase paint or laminate. I know I've seen white dry erase paint at Lowe's.
EDIT: idea... you don't need dry erase paint. Dry erase markers work on all nonporous surfaces. Use plexi or glass. Backlight it, use black plexi, use a mirror, use an old carnival prize mirror with the Guns n Roses logo on it. There are a million ways you can take this.