I only order from the official store
I must say first the customer service is phenomenal. When I had thought I had accidentally damaged my machine, customer service had a video chat with me to inspect it to ensure it was still fine. Second, there are quite often sales where the syrup is less expensive than retail. The option for cylinder exchange is very simple and great for people in remote areas. I did a cost analysis buying soft drink from the store vs using SodaStream, and Sodastream comes out ahead by a lot. I don't mean a slight price difference, I mean substantial. It's a win from me.