Tonight’s Season 3 finale of “Extreme Couponing” introduces Krista, an expectant mother whose pregnancy cravings include Vlasic relish and going dumpster diving three times a week. Above, behold the 7-months Krista explain her couponing addition, then sort through newspaper inserts in a giant garbage receptacle. The season finale of “Extreme Couponing” airs tonight at 10/9c on TLC.