Source for 1/2" thick, 30 Lb HDU?

Hello all… I make custom home & office signs generally smaller than the 16" x 33" limit of my XL and many of them are made using 15 Lb HDU. Does anyone out here have a good source for 30 Lb (or denser) 1/2" thick HDU? It seems the main issue is finding denser material in 1/2" thickness… Alternatively, any suggestions for a different, heavier, synthetic material with similar paint & resolution performance?
Your suggestions would be greatly appreciated.

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