A-2-Z Enterprise via Amazon offers Amazon Prime members the Cobalt Flux Dark Ops Lock 'N Load Gun for Nintendo Wii
with free shipping
. (Non-members can spend $25 or more to qualify for free shipping; otherwise, shipping adds $4.98.) That's the lowest total price we could find by a buck. It turns a Wii remote (sold separately) into a gun peripheral.
Amazon Prime membership is $79 per year; however, Prime is free for college students for six months, and free for parents and caregivers for three months.