eBay with Sun Joe has the Sun Joe 24V iON+ Cordless Metal Detector Kit (24V-MDTCR1-LTW) for $59 - 15% off with coupon code SJUMMERCLOSEOUT [Exp 8/31] = $50 with free shipping.

Along with 1.3Ah iON+ rechargeable lithium-ion battery and charger, this kit includes 180o folding shovel, pouch and metal detector storage bag.