Well popular billing solutions complete with their own order forms are modernbill, whmautopilot, clientexec, and a few others. Each of the ones I mentioned come complete with an order form.
Patron: I'd like my free lunch please.
Cafe Manager: Free lunch? Did you read the fine print stating it was an April Fool's joke.
Patron: I read the same way I listen, I ignore the parts I don't agree with. I'm suing you for false advertising.
Cafe Owner: Is our lawyer still working pro bono?