I got a new Alumacraft 1648 flatbottom last week. It is the model with no center seat and has 4' x 8' open area in the middle with exposed 1 1/2" tall ribs. Until I install a more permanent floor, I am planning on laying down pieces of foam board in between the ribs and then topping it and the ribs with a 4' x 8' piece of rubber stall mat they sell at Tractor Supply.

My issue is that I am having a hard time locating a home improvement store that has the 1 1/2" thick foam boards. Lowes doesn't seem to carry that thickness at any store based on what I saw online and I checked the Cullman location last night just to be sure and they did not have it. Home Depot has it online but doesn't seem to carry it anywhere around here. I'm not sure if that's because we are too far south to need that thick of insulation or what. Anyways, yes, I can sandwich two 3/4" ones together to fit my purpose but that is just extra unnecessary cost seeing how both thicknesses seemed to cost the same online.

I'm just wondering if anybody around Cullman, Decatur, Athens, or Huntsville who is in the construction or handyman business knows where they carry this size.