Walmart offers the Despicable Me 2 Fart Blaster Gun, model no. 20117, for $14.47. Opt for in-store pickup to avoid the $5.97 shipping charge. (Target charges about the same with free in-store pickup.) That's tied with our mention from two weeks ago and the lowest price we could find by $8. It features a variety of different sounds and requires two AAA batteries (not included).