You'd be surprised how little effort it takes to torque your lugs to 80 ft lbs with a 1/2" drive wrench. If you just used a breaker bar and put some muscle into it you would likely be way over spec.
Try sending some e-mail to Ed at this address:
Shoplakeland@aol.com
I bought my set of 2 torque wrenchs from him on e-bay and then he sold me another set for friend. If he still has them, he should be willing to sell them for about $30. That includes shipping!