Thousandshores via Amazon offers the Dr.meter 30-volt 5-Amp DC Power Supply for $63.99 $60.49. Coupon code "APAQ9X3Y" cuts that to $54.99. With free shipping, that's the lowest price we could find by $56. It features a 4-digit LED display, built-in cooling fan, and precision adjustments of 0 to 30 volts and 0 to five amps. Deal ends December 15.