January is a relatively cheap time to find a hotel in Midtown Manhattan. The out-of-town Christmas shoppers and tourists who came to see the holiday lights have gone home.
I've had good luck over the years using Priceline and Hotwire for Midtown hotels. This December I got the Sheraton Four Points at 25th St and 7th Ave (a great location, near Penn Station) for $89 by bidding on Priceline for a 3-star hotel in Chelsea.
Entering Jan 13-15 on Hotwire for NYC produces the following results:
4-star in Chelsea/Madison Sq Garden area for $126
4-star in Empire State Building area for $129
3.5-star in Midtown East for $100
4-star in Central Park area for $145
3.5-star in Times Square area for $158 including breakfast
Results for Jan 13-16 are similar.
With both Priceline and Hotwire, you don't learn the hotel name until you've paid, and there are no refunds... but I've never been unhappy with the hotels I've "won". With Priceline, you decide how much to bid; with Hotwire, they state a price and you can take it or leave it. Hotwire is typically a few dollars more, but you can sometimes make an educated guess at the hotel name (see
BetterBidding for how).