HollowOfWisps
Previously AstroDuck
Are you following plans or do you have experience building? Go with what material is best for your local environment and what will be sturdy enough to stand the test of time. As you have found from your pre-fab coop, what seems cheap and easy in the moment isn't always in the long run. If you keep going with the cheapest route and continue to have to rebuild say even every 2-3 years you will end up spending more money in the long run then if you had invested in the right materials and built correctly the first time. Also $30 for a 4x8 sheet of plywood is pretty fair in this market.