Sears offers the Koolatron Mini Beer Keg Cooler, model no. BKC5L, for $49.99. Plus, Shop Your Way Max members qualify for free shipping. (Not a member? It's free to sign up for a 90-day trial; otherwise, shipping adds $13.56. In-store pickup is also available.) That's tied with an expired mention from three days ago and the lowest price we've seen. (It's a current low by $130.) It fits 5-liter kegs and features cooling to 45°F below ambient temperature, and a removable drip tray and spout.
This item is guaranteed to arrive by Christmas.
Update: It's now available for in-store pickup only.