need help: lifting my jimmy

im going to go ahead and do the torsionbars up and get the rear shackles now all i need is some cheap 30s or maybe 31s if i can get them on there , and i can do the alighment at school as soon as i get the lift on there …any1 got 4 tires either 31 or 30 for 15s that might fit this dont want to spend alot thinking about going to a junk yard maybe