A “Chicken” Java sandwich with organic cheese from eco-eatery Java Green. It’s hard to navigate the ‘net these days without stumbling upon another entrant to the “daily discount” market. Each site has its quirk to set it apart, but the gist is the same. Snag a coupon for 50 cents on the dollar to a hot local eatery, museum, or gym. Or naked Korean spa in the middle of Centreville, VA. Some place you…