You couldn't figure out any way to make that one of your students' "projects" and get some donated labor? 
I replaced the garage doors on my house and found the best deal through Lowes as I remember. Went ahead and got the inuslated door for the work shop and plain steel for the garage. The shop temps are pretty easy to control and the garge doesn't get too bad either even with the non insulated doors. One hint on the wiring, you can't ever have too much light or too many electrical outlets, and add some 220v drops around the shop where you can, they may eventually come in very handy for welders, air compressors, A/C units, or even an oven to cure paint and powder coatings. It's so much easier to add them now before you seal the walls and such a pain later.
'73 Midget (V6)
'59 MGA (I6) under construction
'73 Lotus Europa
"There is a fine line between a hobby and mental illness"