DEWALT 3/4" Stud Finder $14.99 + Free Shipping w/ Prime or on $35+

Amazon [amazon.com] has DEWALT 3/4" Stud Finder for $14.99. Shipping is free w/ Prime or on $35+.

Product Description from Amazon:

Center-find technology to easily find the center of the stud
Detection depth of 3/4 in. for wood and metal
AC and live wire detection for added safety
Constant auto-calibration to save time during use
Center marking channel for added convenience. Slim profile for easy use and storage
Audible alert for clear notification of stud location
Directional LED arrows for visual guidance to stud location
PLEASE NOTE: The stud sensor will not detect objects in concrete, mortar, block, brick work, plaster, carpeting, foil- faced materials, metallic surfaces, or ceramic tile
The stud sensor is not designed to locate non-ferrous or plastic objects, such as pipes

$15