I think you can buy them pre-cut, but most/all of the serious foam builders have a hot wire cutting table (like a Proxxon) and simply make their own.
Small time players. ...at last we will have our revenge.
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Thank you for the kind compliment. I'm hoping that this will be better than my painting (time will tell I suppose).
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@Lizards of Renown @Lord Agragax of Lunaxoatl Worked on the Deep Dive a little last night. Not a lot, but a little.