Lego Super Mario Piranha Plant (540 Pieces) $37.97 (Was $60) See at Amazon See at Target One of the most popular Super Mario Lego sets, the Lego Super Mario Piranha Plant, is currently down to $37.97 (was $60) at Amazon and Target, which is the kit’s lowest-ever price to date. The Lego Piranha Plant set is rumored to be scheduled for retirement at the end of July, so this might be one of your only chances to pick up the…