The delicatessen stands over at Northeast Market--Rex's, the University, and Harry's--are having themselves a good old-fashioned price war. Competition for the wayward appetites of this market's budget-conscious patrons is fierce, and no stall-owner worth his salt's going to stand by and be undersold by a competitor. Hence, the freshly made subs, on soft six-inch rolls, stuffed with basic American meats and yellow cheese. They're interchangeable, and if you didn't see them being made, you'd swear they all fell off the same truck. But listen, they taste good--a little bit of hots and a squirt of vinaigrette goes a long way. For $2.99, the customer gets a bag of Utz and a 20-ounce soda (32 ounces at Harry's). Classic "loss leaders," these subs are priced so low that customers will actually approach the counter with their hands in their pockets and, possibly, return on payday for the stalls' better stuff--Cuban sandwiches, reubens, and Italian cold cuts, all hand-assembled by friendly people.