I ordered though a company called Elephant Structures, but in the ned, them, and several others are supplying buildings from Carolina Carports.

It was a little strange, Carolina would only let you configure some things a certain way, while others let you "build it" more like you want it. For example to order from Carolina, to get 9' x 7' doors, they required the wall height to be 9' or 10' ... Through elephant, I could put those doors in with 8' walls.

Mine is anchored to the slab with anchor bolts. They will install on dirt of gravel as long as it's level and use screw augers to lock it down.