Multiple prices for multiple countries

I'm working on a multiple countries project. Until now, we only sold to one country, but we're working on letting users from its neighbour country (speaking the same language) buy our products. For legal reasons, products don't have the same price, depending on where the user is living. And we don't know (for sure, because we can try to guess) where new user lives.

So, now I'm having trouble deciding a few things :

  • on product pages, should the "historical" price should be bigger ? (Since most of the customer base lives in the "historical country")

  • how should I label the prices with a flag? with the country name?

Trying stuff for prices

  • on listing pages (where space is counted), I'm hesitant as displaying two prices (and maybe more in the future). But "From XXX" doesn't feel right neither as the price cannot be decided by the user (it depends from her address). What is less worse?

Thanks for the feedback :)