Need Quick Garage Cost Info ASAP !!

Long story short for now. How much garage can I build for 75k in the Nashville area? I've been dreaming of building a barndominium but I came across a property with an existing home that looks like it might be perfect for me. I am in Connecticut. My TN realtor is looking at the property tomorrow and bids need to be in by 2pm !!!
I will have 75k left in my budget if this place looks good and my offer is accepted (yes I am very lucky but worked hard). The shop portion of my proposed barndo is planned for 50x50, so if I can build a 50x50 garage for 75k I could be golden. Any thoughts are appreciated.