Recently we registered to rent tuxes from Mens Wearhouse.  Their current promotion is rent four or more tuxes (from cheap to expensive) and get a free tux rental or any suit in the store up to $400 free.  Pretty cool.  I went with the suit option and had it tailored to fit for just a bit extra.  The deals are the same at any location store, the Grape Rd. store in Mishawaka helped us out great.