Well, I think it is a bit high, but it depends on what you want. I went with a cut, fab and weld kit. Basically just all the materials. Also, I have not seen any sheet metal warrantied for over 20 years. It is only warrantied not to fade for 20 and against catostrophic failure for less, usually around 5 years. Just some of that good ole fine print. It cost me $5000 for my 30x40x12 steel building delivered. I also did my own concrete work on the buddy system and it cost me $1500 for costruction materials and concrete.
I am however, very thrifty and found the absolute most economical way to build my dream shop. I figure I am not going to pay for any work I can do myself.
Also, I would save for a little longer and get that concrete floor. You will be much happier.