Amazon offers its Prime members the Zircon StudSensor e50 Electronic Stud Finder
plus free shipping
. (Non-members can spend $25 or more to qualify for free shipping; otherwise, shipping costs $5.18.) That's the lowest total price we could find by $11. Sales tax is added where applicable. It features a deep scan mode to double the detection depth up to 1.5", wire warning detection, LCD display, and more.