Are you looking for personal use (ex. a place to buy Castelli, Peal Izumi, etc.) online, or a place to order custom kits for a team (Champion, Kiwami, Voler, etc.)?
For the former I'd recommend Competitive Cyclist.
For the latter, I've had good results with purplemoon (stuff is from China, but they have a good online design system, good customer response [the English is a bit rough though], and super-low prices). I've used them for 1-offs and for team orders. They only do cycling stuff though (no tri). A racing team will want better stuff, but if you want some kit for a casual club or a special event they are great.
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