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It may be to late, but I am building a superinsulated house and I needed to purchase a lot of XPS foam to go in my walls. I purchased some "factory seconds" foam for about one third the price of what the foam sold for retail. Most of the foam sheets were in very good condition, with minor errors in printing or some "holes" on the surface. Some were so good I still don't know why they weren't retail. I did have some sheets with "waves" in the surface which still worked for me but wouldn't in your application. If you still have a lot of foam to buy it may be worth your time to check on getting some, just make sure they don't have waves.
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