Hello,
Just to advise the 'Northern' group of a supplier in Vancouver for minicell foam. It's as direct to the manufacturer as you're going to get as the material is imported from the UK. I bought a slab 3" X 48" X 80" for $170.00 CDN. (~$108.00 US) OK, you're going to have to get busy and build a few boats, but it's far less expensive than buying little raw blocks elsewhere. And no, they don't sell smaller pieces. Just make sure that little rodents aren't able to make their bedding with it!

ALLFOAM INDUSTRIES
12391 No. 5 Richmond, BC
V7A 4E9
604-277-7710

Good luck, and of course if anyone has it cheaper let me know!