[redguava]

I agree this won't show what your customers prefer, because you aren't giving your customers a choice. This might show you which of these your customers will buy from if they have no choice though.

If you want to see which they prefer, why don't you just have all three options on the page and see which one gets the most sales? Surely you can just see how much revenue is coming in from the different outlets?

It seems to me like this isn't a great use case for a/b testing. If you have all three options and one of them never gets used, stop showing that option.

[pixelcort]

If anything, you could A/B test the order in which the options are shown.