I got a rough quote for doing a pole barn. 30'x40'x10' tall walls. One 40' side has a service door, an 18' wide and a 10' wide garage door. So, roughly 1,100 sq. ft. Spraying the walls only, not the ceiling. 2" thick would give approximately R16 and would be around $7,000.00.
I don't know if that's high or low. If any of you get a quote, let me know what it was because I'm curious to see how honest the guy was.