Walmart offers the Trademark U.S. Patrol Alarm Security Bar, model no. 82-5322, for $25.99. Opt for Site-to-Store pickup to avoid the $4.97 shipping charge. That's the lowest total price we could find by $5. It measures 19.75" x 11" x 10".

Note that Amazon offers it for the same price shipped for Prime members, although stock is limited.