Code R decals out of California makes some really nice, magnetic, and interchangeable panels. I don't know about cost though. We used plexiglass or lexan panels, painted. You can spray paint them if somebody is handy with a rattle can who has a steady hand, and buy numbers to stick on from any decal company who can give the right font, shadowing etc.. Then we would slide the panel into the aluminum channeling and remove or replace as needed. Aluminum channeling was fairly simple and low cost. Easy to attach to the apparatus. But to each they're own. Depends on what your willing to spend, and adopt as your own.
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