I don't really know how that works as I choose to sell (largely) domestically. However, if I needed to list a whole bunch of places, you could always use one of these options as a fall-back:
- Put in the description that they can contact you for a quote to their location
- Use a single "international" shipping option
I know when I shop online, I've seen stores based in the US offer: US, Canada, International (or sometimes, US, Hawaii, International)