For those of you lucky enough (Ha!) to have to lug one of these along, Big 5 has the Counter Assault Bear Keg for $69.99 and if you sign up for their e-mail harassment program, you can get 10% off on the spot, for a all-up-price (including taxes) of $68 and change.
The cheapest I found on the internet was $75 shipped.
The cheapest I found on the internet was $75 shipped.