I used a prefab for 2 years. It's now partially gone, but what remains is the run extension (now a rain shelter), 1 welded wire wall (screwed into current coop to hang oyster shell and grit dispensers from), 2 partial walls (which I have behind my house to keep the dogs from running to the...
Maybe a hoop coop? They're fairly cost efficient compared to most builds.
If you do end up buying a prefab coop don't think of it as "I don't want to waste money for only 1 year's use" - think of it as something that you can reuse in the future for brooding, isolation, etc. and aim to get...