Hihi, couple of clarifications. What country are you based in? I did a quick search on Amazon UK and it didn’t show anything helpful so it doesn’t look like it, but if you have a specific listing in mind and want to check if that is compatible then link it here
According to this, the pinout is relatively straightforward so you could buy a generic momentary button. If it comes with JST PH then great, if not it depends on how comfortable you are crimping or soldering but generally it’s not a big job. Easiest way would be to order a pre-crimped 6 pin JST PH connector and solder it to the wires. I’m not 100% sure why it seems to have 2 button and 0 ground connections though, looks like an error
Failing that, you could just ask in the Wanted Items Cheap/Free thread and see if someone local can send you one