Heating a cinderblock garage
I called it KB board but I think the proper term is OSB board. It is basically a plywood board made out of large wood flakes and resins. Some people say OSB is better and stronger than plywood and some say it's not, but it is used by a lot of quality building contractors in place of plywood. I don't recall what it cost to have that cellulose blown in but you can price it at your local materials supplier and maybe Home Depot.
Neil is right, you can actually de-bag the the insulation and spread it manually. If you don't mind climbing through the trusses and be sure to wear a very very good quality dust mask. You don't want those to expose your lung tissues to the fibers. I would talk with some experienced people before I tried it manually to decide if the cost savings are worth it.