Walmart offers the LEGO Ninjago Kai Fighter Set, model no. 70721, for $14.97. Opt for Site-to-Store pickup to avoid the $4.97 shipping fee. (Amazon charges the same price with free shipping for Prime members.) That's tied with our mention from two weeks ago and the lowest total price we could find by $4. This 196-piece set includes two mini-figures with weapons and an accessory.