I always wondered how much one can make by buying AC units on Craigslist in December and selling them off in June, in a place like NYC where weather gets very hot/cold :)
I do that in NYC with bikes (buy winter, from people who made impulse buys in summer and have nowhere to store them, sell summer, to people making impulse buys.)
I think the NYC market has so many constraints and peculiarities (plus money!), its rife with these kind of opportunities.
