The likely answer is that you are in a location where we are currently unable to sell. Each country has its own laws and regulations that we must abide by, and while we intend to add more currency options to our website, as well as offer more shipping locations in the future, meeting legal compliance can take some time.
In the meantime, we recommend purchasing products through a D’Addario retailer within your region.
If you need assistance finding a retailer, please check this list of international distributors or contact us.