In more flush economic times, there were all of those jokes about the proliferation of coffee shops and fast food locations, like the new Starbucks opening in the bathroom of a preexisting Starbucks. Now restaurant owners and chefs are actually branching in, not out, opening new mini-locations inside their own dining rooms. Tom Colicchio cordoned off one part of the Craftsteak dining room to create the more economical Halfsteak, while his executive chef Damon Wise launched the similarly bargain basement Frugal Fridays. Now, Michael Psilakis and Donatella Arpaia are openingAnthos Upstairs tomorrow night as an annex of Kefi; the new restaurant’s menu is said to be a lower-priced alternative to Anthos. Even the venerable Four Seasons is launching a luxe (yet discount) minibar, of sorts, this week dedicated to sustainable caviar: the Calvisius Caviar Lounge, where seven grams of sturgeon eggs with blini can be had for the comparatively lower-priced (for caviar) $25.