TipTop has a sale right now, some decent looking suits for $100. Me and my buddy went shopping for a friends wedding. Bought tuxes for $100. Never had a tux, so for $100 what the hell.
It's not going to get you something super high quality, but if you're going to be wearing them a few times a week, and your an intern (ie, not making very much, if any, money), I'd say it's best to go get 2 or 3 suits for less than you'd pay for one at O'Connors or Harry Rosen. Just my two cents.
Designer Depot is good for cost as well. Not a tonne of selection sometimes, but you can get some decent clothes for cheap.
***Ducks as peter12 throws a $1200 shoe at my head***
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