The problem with NY is tax, both from the stores and from places like amazon. However, you said NYC area, so if you have a shipping address in a nearby place like New Jersey, where I live, then Amazon (limited options), or B&H Photo which has a number of custom BTO models in stock, most models with attractive prices - below Apples.
Here is a list of models available from B&H, which is a superb store, especially if you are a photographer like me.
One other option, is MicroCenter.com in northern NJ which has a few 15" models and only charges 3% tax (in the NJ store). They have some nice deals on at times, especially on the 13" models.
If you are going the NYC then just take a cab to best buy or an apple store nearby and pick one up. It'll save you the cost of shipping and if you have any problems you can just take it right back and not have to send it to a company and wait for them to send a replacement or fix your unit.