It shows $0.00 for me too. There are quite a few channels that it says I can "buy" for $0.00. However, when I try to buy any of them, after I click on the Buy button, at couple of minutes later I get a "Sorry" box with a message: "Oops. The channel could not be added due to an unexpected problem."
I get the same message if I try to add a channel that requires a payment greater than $0.00. I would expect it not to work, since I don't have a payment method associated with my account. Although I seem to recall that in the past if I tried to add a channel that required a payment, it would tell me right away that I needed to add a payment method to my account instead of keeping me waiting for a couple of minutes then giving me an "unexpected problem" error.
I'd be curious if anyone can actually "buy" a channel for $0.00 if they have a payment method on their account -- and would they get billed $0.00. Either way, the channel store seems messed up (again).