Walmart offers the Max Professionals Super Blast Pump Air Horn for $9.69. (Amazon charges the same.) Opt for in-store pickup to avoid the $5.99 shipping fee. That's tied with last week's mention and the lowest price we could find by a buck.

Update: It's now sold out at Walmart; however, Amazon still offers it for $9.69 $8.91 with free shipping for Prime members.