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You can get 2.5 and 3" band clamps at Carquest. They don't come with the "bump" or step in the middle, but they end up looking like that when you tighten them down.
NAPA also carries them, tell the dude behind the counter to look in the balkamp book or the exhaust book. They carry the preformed and the non preformed clamps...if you need to buy one without having to wait....