There isn’t a built-in option to limit carts to a single product. We haven’t come across this feature request before, most stores aim to maximize sales and have customers purchase as many items as possible.
If more people think this would be useful to them, please post in this thread.
I really need this… just a thought…
would it be any easier to implement at the “Product” level?
(So if option checked, it goes straight to checkout?)
Fred
Basically, the reasoning is the same logic (as the shipping / billing issue), in that product might be sourced from USA, and therefore other items sourced from other countries can’t be on the same order.