A special at Amsterdam Diner costs around $15.00 per person. It includes soup or salad, wine (which you can replace with another beverage), and an entree that comes garlic bread.
Mmm...French Onion Soup! I would call this a good deal for Manhattan -- considering that wine and french onion soup work their way onto the menu.
This diner receives mixed reviews on Yelp, but I thought it was decent in terms of price and portions for the Upper West Side.
Check it out if you want to feed your stomach: http://www.yelp.com/biz/amsterdam-diner-manhattan