Swerve is extremely rare. He never saw Wal-Mart distribution, so the entire country was fighting it out at Targets (1 case at a time) and Toys R Us (swarmed with older cases)

Also, there is no Binaltech counterpart, so finding a substitute is impossible. Decepticharge is sort of the same way ... but he was released in one more case assortment than Swerve.