At participating Baskin-Robbins locations, buy any 2-Scoop Sundae on Wednesdays and get a second one for free. That's the best offer we've seen on sundaes from Baskin-Robbins. (It offers a different flavor of buy one, get one free cones each month.) Sales tax is added where applicable and some exclusions apply, including layered sundaes, junior sundaes, and brownie sundaes. Deal ends March 27.