air transat has some really killer last minute deals up here in canada... check out if there are charters operating at your city's airports.
newbiepcuser: stand by is still there, although airlines don't like it, so it's not there in the sense that i think you're referring to. right now, if a passenger came up and asked for a stand by ticket, they'd probably get full-fare ticket and the inconvenience of being on stand by. althought this may be different in the states, i'm not sure about that.