I did look for any PU or EPS type 9 in my area, but didn't find anything that suited my needs. Found some PU, but only in thicker sheets that would have resulted in a lot more work and expense.I just had a look at Carbon Core, and they have low prices on 2lb 19mm PU sheet... only $28.80. https://www.carbon-core.com/product/pu-pir-structural-foam-sheets/
Their shipping is sort of a flatish rate ~$350 IME, but it might be worth checking out. Also, have you looked at PU sheet suppliers locally? Boat builders may have it or can get it.
I'm going to give the pour foam a try as soon as I can. At the cost of any alternatives that I have found so far, it will be much cheaper even if I end up wasting product with the overfill-and-shave down technique.