Newegg has the Rosewill REGD-6361 3-in-1 Detector Metal/Voltage/Stud Detector with LCD Display for $15 - coupon code EMCMLMT32 [Exp 10/22] = $12 with free shipping. Features sound indicator, power shortage warning, weight 0.32 lbs and 1 year warranty, battery not included.
Some rather poor reviews on Newegg with people saying that it doesn't detect studs. What good is it then? Anyone know a better model?
Zircon makes several different units - have had good luck with them. www.zircon.com/
I use this to detect radioactive isotopes.