Does anyone know the best type of plastic material used for image relief, and a good source in the US?
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I've used these before (in error really as I didn't realise they were in the states 
)
They always seem to have lots of quality acrylic pieces that have been left over from jobs at good prices
Try them out:
https://stores.ebay.co.uk/FRIGO-DESIGN
You need to be looking for CAST Acrylic, which cuts pictures better than extruded acrylic. Go for 3mm or 1/8th inch thickness
The stuff I got from FRIGO had a brand name of Lucite - maybe something to search the internet for
)They always seem to have lots of quality acrylic pieces that have been left over from jobs at good prices
Try them out:
https://stores.ebay.co.uk/FRIGO-DESIGN
You need to be looking for CAST Acrylic, which cuts pictures better than extruded acrylic. Go for 3mm or 1/8th inch thickness
The stuff I got from FRIGO had a brand name of Lucite - maybe something to search the internet for