cheap tuxedo source?

I have need for a few tuxedos, and I am wondering if anyone knows where to get them cheaply. I've already done the Salvation Army/Goodwill/garage sale thing, and there are none to be had. I am not going to be spending hundreds of dollars on these. Is there someplace that sells them used? What happens to old ones, or ones that got ripped/torn/too dirty to clean? Those would be great for me.

check tux rental places, its getting close to grad time, and they do indeed sell them off when thats all over, ususally in the 70-80 dollar range when ive seen the signs up......just go in and ask, and im sure most youd go to would have stuff.

I bought one on ebay for $25.00. It's a great tux too!