If you call, they should offer a one pay option. They will also offer things things, as soon as you say no, the agent can move on with your order.
I looked on the site, and I think there will be a one pay option there, too. It looks like you give your info, they will tell you about more stuff on the next page, and then they will give you a payment option.
If you decide to get it, let us know how it is.