Get your checkbooks out – it's bargain time. The average price of a Manhattan apartment has dropped from $1.2 million to $1.1 million.
And at those prices, we're talking about real luxury: a 500-square-foot studio on the fifth floor, with a view of the service entrance of the 30-story building next door, which blocks out all the sunlight except between 11:50 a.m. and noon. It's in a so-so neighborh…