Go buy vintage tuxes together then. I got mine for $140 at a local consignment store. Also check out these sites:
I purchased from all of those sites, and can vouch for their good customer service, and prompt shipping to North America (all three are UK sites). BTG also has a bunch of budget Tuxedo websites listed in its "Buying" section. Nothing wrong with renting either, though I think you can buy for the same price, or close.
I can also vouch for Clermont Direct, as it's where I bought my striped trousers (pictures earlier in this thread) and a pair of braces. Given that they ship from the U.K., their prices are pretty good. The quality of the pants also seem to be good to my untrained eye (although I can't speak to their other items like jackets, shoes, etc). I was also impressed that it took less than two weeks to receive my order. Sometimes with overseas shipping times, you never really know.