Occasionally some members here shop internationally because some of us have import permits and would like to obtain plants that are otherwise impossible to near impossible to obtain locally.
(Shameless plug...
) - For example, I have an import permit and I do occasionally shop internationally. Another member on the OB who has a permit and does this is Ronald Hanko.
There are times when we will ask other members if they would like to get in on a group order from international sellers who are not necessarily big on the radar, but do carry really exotic orchids that people would have a tough time finding here in the US.
Buying internationally is costly and can take a while. There are rules and regulations, as well as proper paperwork to handle before plants can be legally shipped across countries.
Also, be aware that some plants that are sold internationally may not be allowed into the US for whatever reasons the USDA/APHIS has. One such reason would be that the plant may have the possibility of becoming invasive should they somehow be able to get out into the wild within certain parts of the country.
Here's an example of an orchid you may have a tough time getting into certain parts of the US (particularly if you're from the deep south) - Eulophia graminea.
Here's an example of an orchid people living in semi-arid deserts here in the US may have problems getting into the US, mostly because it has demonstrated that it's invasive tendencies in certain parts of another country (Australia). That problem plant would be Disa bracteata.
I'm just giving you a taste of what to expect when you're buying internationally and have to deal with rules and regulations that most hobbyists who do not shop internationally do not necessarily encounter when they're shopping for plants.
If getting in on a group order with any member here on the OB to purchase rare and exotic plants internationally from somewhat obscure vendors is not your thing, then I recommend going to orchid shows where some prominent international vendors will attend and sell their goods and wares.