In my neck of woods it is umpossible to by bigger sheets of styrene as the markers in Oslo will only sell to companies only.
Whwn I asked several sign makers in my area, they could order that, but shipping will be killer.
One said he could order next trime he needed something from the same place, 2 years later I have not heard a word...
I have a friend with a sign shop local to me and he uses allot of styrene. He gets his stock from Plasticworld.ca and usually gets me a cost price so that i can resell styrene sheets in my shop.
I try and keep .010, .020, .040, .060 in stock in various sizes.