Amazon offers Prime members the Cuisinart Electric Knife, model no. CEK-40, for $24.98 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $8.54. Wayfair charges the same price.) That's the lowest total price we could find by $21. It features a pressure-activated trigger, carving blade, bread blade, safety button, and wood block with blade lock.
Update: It's now out of stock at Amazon; however, Wayfair still offers it for $24.98 with free shipping.