Some local places
https://www.capitalcitysigns.net/
https://www.signsbytomorrow.com/madison/
https://www.fastsigns.com/364-madison-wi-odana-rd/products/solutions/listing/signs-and-graphics/electrical-signs
I was researching a few places when I was thinking about making a custom translite, but got too lazy and never got around to calling any of them