Source for Audi Tools Or Rentals

I'm getting ready to put a new timing belt on my 1990 V8 Quattro, and need the crank locking tool, *3197 I think, does anyone know where I could rent it, or have one I could rent, or worst case scenario, a cheap source, the only one I've been able to find so far is $127.00 for a tool I'm going to use once every 80,000 miles. Thanks for your help John