You are welcomed AudioDwebe. Seeing as you are located in North America, I'm not very sure if the local distributors at your local region have these Audio-technica accessories in stock. If you do have trouble locating them yourself, I would suggest you to just grab them from Bluetin online, as they do ship internationally and they get their stocks straight from JP, with their office warehouse located there so I suppose you won't have to wait too long for them to confirm shipment to you, after placing your orders. The ER-CK9 stock silicone tips replacement box do come in 3 pairs in either S, M or L size, you may have to indicate your preferred size to them under the comment box after placing your order, since they do not sell these with all 3 sizes included like what you get bundled with your CK10 out of the box.
Hrm, I see reference to people using the Shure triple flanges. I have a pair of these, and the stalk diameter (and inner hole) looked woefully too small to fit on the CK10. Do people force them? Are the Ety's or Monsters a larger diameter stalk, or the same as the Shure?
No personal experience with Shure tri-flanges myself. Etymotic Research's tri-flange stalk diameter is indeed alittle small compared to Monster tri-flanges (which fits just nicely on both CK10/CK100), but according to my own experience and what RADI0HEAD had wrote, its true that the Etymotic tri-flanges are pretty stretch-able to fit the nozzle tube without issues, at least there's no need to do any form of modding unlike with Shure Olive foamies as far as concerned.