Graham,
I have spent abit of time in the past looking for 'pit board' material. It not that difficult to come across but it can be expensive, I looked into buying a big sheet from a local sign maker but it worked out something like £300 for a 1m x 2m sheet 10mm thick !!!
eBay is probably one of the best places to look for a ' one off' bit but as they are quiet large items the postage is a killer !!
I ended up getting abit from a mate who knew a mate if you know what I mean
I know my reply hasn't helped your search much but it might give you something to think about
Be interesting to know where others get it from
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