Where should I buy a tuxedo?

I’m attending a wedding next weekend, and everything I’ve read suggests I should buy instead of renting. I’ll definitely need one again at least 2 or 3 times a year for the foreseeable future.

I know nothing about buying a tux (or suit.) Where should I go? What questions should I ask? What are some things I ought to know first, or should look for?

I work in the Heights, and live near Bear Creek. Any advice is much appreciated.

[UPDATE] Jos A Bank is having a President’s Day sale, so that’s the short-term plan. Suit Supply is looking like my front runner for future/investment pieces. Thank y’all for the input, I’m useless at this kind of stuff on my own.