Amazon offers the Black & Decker 20-volt Bare Max Lithium-Ion Alligator Lopper Saw, model no. LLP120B, for $66.99. At checkout, it drops to $56.99. With free shipping, that's the lowest total price we could find by $10, although most charge around $84 or more. It cuts branches up to 4" in diameter and offers up to 150 cuts of 1.5" branches per charge. Deal ends March 30.
Note that this model does not include a battery or charger.