Concepts has been holding down the Greater Boston area for forever it seems. Whether stocking everything from Nike SB to Gucci to Visvim, or holding buy one get one free sales, Concepts knows quality and value. The shop's latest sale is no differentâ€”selling Filson x Burton, A.P.C., Carhartt W.I.P., and Maison Martin Margiela sneakers for up to 50 percent off. We know you're strapped for cash after the holidays, or maybe you came up on gifted cash. Still, this is a well-edited selection of sale items that you could actually use.