Wrong forum Corrugated roofing for shed

I'm currently building a shed (24' x 12') and I will be tackling the roof next week. Does anybody know where I can buy corrugated metal sheeting for the roof (in the NW if possible)? Also, if anybody has some handy tips that I might not have thought of I would be grateful if you could share them.

Your local co-op should stock it.

To stop drips in the winter, put up felt first held up by chicken wire.

( FYI: Corrugated is nailed/screwed on the ridge, box cladding is nailed/screwed in the valley)