I got vinyl corrugated roofing panels, $3 ea. Habitat is a hardware thrift store, they have many needed items, not just lumber. Door and window hinges, poles for fencing, paint, nails and screws. Time is valuable, with a full time, plus overtime job, house and yard to take care of and outside activities, I certainly am limited in time and energy. The extra time I take foraging for materials doesn't compare to the additional time an inexperienced and incompetent fly by the seat of my pants construction worker takes to accomplish a task. Let's see, girly arms, double estimated time to drag materials to the construction area, triple time to nail boards together, nail, bend nail, pull out nail, drill a hole in the wood, tap a pilot hole so the drill bit wont slid all over the wood, and nail again, -- repeat, add time for first aid care. Position ladder, re-position, smooth dirt under ladder and re position. At least 4x the amount for getting a bright idea, finding out it didn't work undo the work, go back to original idea but add duct tape, now it looks redneck ghetto. So you can see, being someone who can take almost anything and make absolutely nothing, buying new just make no sense.