I have not priced any in over a year. usually 30 foot. $1 a foot. La stem is nasty though.
Might I add to find cheap drill stem around here you find some individual that came on a bunch cheap. The metal jockeys are out to make $$$$$$. Back in Ok and Mo there is Wheeler Metals that sells lots of used pipe and such. I saw where they are getting what was it??? $2.75 for 2 7/8??
For most garages, I say 2 3/8 is probably good. Unless a tornado hits and nothing survives!!
Now is not a good time to build ANYTHING!!