I don’t know how close you are to a Home Depot but they make plywood project panels of various woods in 1/4 and 1/8 inch thicknesses that are 12"x19". This is a little smaller than proofgrade, but I have found they fit the printable area of my Plus pretty well, and they come in packs of 10. I definitely recommend some Honeycomb bed holdown pins because the panels can sometimes have a slight curvature and the pins not only help achieve a flat cutting surface but also help consistently align the smaller sheets.
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