I'll post again when I find the pics, but I built a 12' x 30' shelter in my sideyard to keep the rain off my stuff. No sides yet, but am planning on doing that this year (enclosing the shelter). I did everything myself - 4x4 post uprights, 2x4's for framing, and 1x6's atop to screw gavalume to.
It has a slight slope to it so the rain can slide off.
But I was looking at Home Depot sheds and saw this one that looks like it would be a nice option for those who may not want to construct one from scratch:
Newport 10 ft. x 12 ft. 2-Tone Eggshell and Coffee Galvanized Metal Shed with Sliding Lockable Doors
Only $469 and has a lot of good reviews along with customer photos.
I like that is has no windows!