Amazon: Deal on Lego Ninjago Neat Oh Battle Arena June 25, 2014 at 9:48 am By coupongeek Amazon has the Neat-Oh! LEGO Ninjago Neat-Oh! Battle Arena marked down to $7.91 from $22.99. Thanks, Couponing For 4! It folds up nice for storage. Plan Ahead for birthday parties, holiday gifts, summer fun, etc!