If you're like me and recently acquired one of the GSO made 6 or 8 inch RC scopes and have been waiting for the collimation rings to come back in stock for a loooonnnggg time, I feel your frustration. I finally contacted GSO and asked them when these things will ship to US dealers. They responded within a day telling me they are in stock at Global Optics which is in Taiwan. Tired of the wait I ordered one from them expecting it to take weeks to arrive and amazingly it's arriving today, three days after ordering it! Amazing service. The tracking info says it's coming from GSO so this must be a retail store of there's. Here is the link, https://www.globaloptics.com.tw/categories/collimation-tools