Ive have delt wirh alot of pan formers and the cheapest one that I have found is a company called commercial Plastics Co in Republic Montana their phone number is +1-800-642-4087
just so you just so you know you can use a flat face if it's under 4 by 10 and you have a minimum of 5 in between the lighting source and the
sign face
if you if you have a pan face and it has first surface graphics on it and you want to strip it you can chemically clean it if it is back sprayed then you cannot
the the chemical I used to strip it is acetone you take a little on a rag and wipe it across the face it will take the sun fade and the yellow off the first couple surfaces
also also when you call Commercial Plastics you have three choices of material you can use acrylic you can use modified acrylic or you use polycarbonate I would not recommend acrylic for cold applications but the modified acrylic works great good luck