I got it at bunce, but american steel makes it. I left both ends unfinished they wanted $900 a end to close it in, I bought the tin to close in both ends and the garage door for $900. They will try to get you any way they can.
I had a similar one put up last year, only not as big 18x20, 10' walls. I have really enjoyed it. I closed in the back myself with vinyl siding. How are you going to do the door? That's what I would like to do next, along with a concrete floor. I have gravel right now Looks good, I know you'll enjoy it!
im almost finished. need to put up some pics. I put a 10x10 panel garage door in it. what a bitch, took me two days to get that up by myself. All im lacking is the cheap stuff now. i need a walk in door and enough gravel to fill in a 10x20 dirt spot in the back. And Gutters.
and then she will be ready.