Since your thread title wasn't limiting on material, have you seen the assortment of corrugated styrene from JTT, the scenery division of Model Rectifier??
Their sku's...
97402 1:100 (typ. HO)
97403 1:48 (O)
97404 1:32 (G - std)
97405 1:24 (G - ng)
97406 1:16
All are $6.50 for two (2) sheets 7.5"x12"
Cuts well. Paints well. Corrugated both sides. Available at most LHS's that stock JTT products.
Still prefer paper?... Northeastern Scale Lumber makes strips of corrugated paper roofing in several sizes, the O scale size having sku 55053, 5 strips @ $9.72, avail. through Walthers/dealers. Maybe more pricey than Michaels' version, but better proportioned.
FWIW, always...
KD (aka, Lucas Gudinov)