Game stores and/or retailers have to order them, and then they are used to host league/organized play.
So, if you can organize play groups in your area to a consistent meeting time (even if its just 4-6 of you) on a regular basis and can work with a local game store to host it, you can try to start up an OP in your area.
Our area happens to have a really supportive game store and a decently connected Facebook group to help put them together.