Last year on Black Friday we picked up a Garage in a Box at Tractor Supply for $150.

We live near Lake MI on a hill and we can get very strong winds too. The "garage in a box" has shown to be quite sturdy. We store all of our bikes in there: 4 mountain bikes, 2 road bikes, 2 children's bikes, 1 bike trailer, and one tag-a-long bike. We also store a tractor and other miscellaneous stuff in it. It's quite large. We do have to lock the bikes to a secured bike rack in the shed.