Certified GKH Gardening Expert
Many countries have laws regarding the import of organic based products. These laws are designed to prevent plant diseases and invasive species from crossing international borders.
If you are going to buy seeds from overseas, check to see if the company has been authorized to sell to your country. Basically, they would have gone through a process where they are certified as being free of diseases and species that could be a problem in your country.
You should also be able to find a company in your country that supplies these kinds of seeds. If you are unable to find one, try looking for other like minded gardeners who would like to trade seeds with you or check on places like eBay for small suppliers of these kinds of seeds.