I'm not related and yes I've brought up Hamilton Supply as I've been happy with the quality of their Cartridges and you can be sure they are actual CCells.
You can also get actual CCells here:
https://www.kushsupplyco.com/ccell another supplier but only does wholesale.
I was told about this guy who has them much cheaper:
https://www.dhgate.com/product/ce3-510-cartridge-vape-tank-gold-metal-plastic/404102717.html
I have heard that most of them are good but when smoking/vaping something I worry about it being what it says it is. Anyway no offense was intended I simply asked if he was affiliated. I am comfortably retired from software engineering. I sell nothing and was simply sharing my experience about the cartridges as the right ones to vape very thick distillate were hard, for me, to find. It actually took me a couple years.
Sorry if you found that offensive.
Annie