Amazon offers Prime members the Extech Electrical Test Kit for $17.99 with free shipping.
(Sears charges the same via in-store pickup.) That's $2 under our mention from three days ago and the lowest price we've seen. (It's the best deal now by $7.) It includes a multimeter, non-contact voltage detector, and receptacle tester to measure AC/DC voltage, DC current, resistance, and continuity, as well as diode and battery tests.