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4x4 fence post" should say "4x4 post base", I thought it was doubling up the 8' 4x4s until i clicked.
I do have some treated 4x4's, but they are not 8' and are previously used but in good shape. they are also painted poorly, so they'd need repainted, not just stained/sealed. I don't think I have enough for 11 4' sections, but added to other found materials and painted to match it could be usable.
the pallets have heat treated wood, which means no bugs, but not pressure treated which means it'll rot faster than if it were. diligent sealing can prolong that, so if that's something we want to add to annual maintenance then that can save nearly $200 up front but end up spending more in paint/sealant later. we can also rip cut some to 2x4's. not easy with a portable saw, and still not pleasant with a good table saw. I do have a 10" circular saw with guide that would make relatively quick work of it though.