Building materials (Madison area, boondocking)

I have a small pop up camper I have been converting. I am looking for a solid wood door that can be cut down to size, 2x4 so I can install the two windows I have and two solar panels. Insulation material. 1x3 trim. Could really use white primer too. Military disability pay makes this a slow process as I can't afford the materials.
Can you help with this request?
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