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landscape timbers typically ARE pressure treated. Just FYI. Construction/standard lumber would be the way to go if you want to avoid the chemicals of pressure treated wood. Also, cedar boards would be an option for a naturally rot resistant wood without chemicals, but it can be expensive. Take a look around Home Depot, Lowes or Menards and compare the costs of each option. Personally I like to buy 2"x3"s because they are often less than $2 each for 8' boards. One 2"x3"x8' would build a 2'x3' frame, which is perfect for the 3' wide roll of wire I have.
I use the 6 inch by 4 foot or 6 foot untreated cedar fence boards in my garden and pens. They are cheap, easy to find at Lowe's, Home Depot, etc., short enough to carry in the car, last pretty well and won't poison anything. When they wear out and are no longer useful, they go into the brush pile next to the compost.