Need Quick Garage Cost Info ASAP !!

I built a 30x40x10. One 10x10 door no windows. 4" thick concrete nothing finished inside and no electrical at the time. but me and one guy built entire the shed start to finish in 3 days. concrete poured and finished the 4th day. I did all the prep and site work myself. I tied and laid all the rebar by myself and all said and done it cost me 18k and wish I would have built an 80x120