Amazon has them. But I agree with Jen, they look expensive.
These are listed as a six pack of 2-ounce bottles for $32.30. ($5.38 per 15-carb bottle).
I will stick with our Apple Juice. About 10 cents for the same amount of carbs. BG rise seems fast enough for me.
https://www.amazon.com/Acting-Glucose-Liquid-Berry-Twist/dp/B01864LJBK/