Frontier Airlines, one of the most decent US charter airlines, is offering rock bottom prices out of Buffalo to several locations in the States (yes, Frontier does fly into Canada, but only Western Canada right now). I've known people who've flown it, and have been very happy with Frontier.
Keep in mind that Frontier will allow you take carry one personal item (a suitcase small enough to fit under the seat in front of you). Other than that, you're better off checking in as it's cheaper than a carry-on bag, so pack light and avoid the extra charge!
Most flight dates start October 23 and end between November 12 and December 18.
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October 23-November 14th from $29USD each way
-November 12 for $29
Nov. 15-Dec. 18, Fort Myers from $49
Nov. 16-Dec. 18, Tampa from $49
October 23-Dec. 18, Denver from $59
Book fast as these prices won't last!