jeeeez, so demanding.

Ok, Running Count Racing Numbers seems like a good place to go. They do custom number printing on Tyvec. I called them. You can send them a graphic and they can print numbers in the forground, at a cost of $0.21/each + $18 set up fee (I think you can skip the set up fee if you send them the graphic in the right format, but I'm not sure)
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//matt