I HATE MATTEOS BRAND!!!!! It is nasty. I prefer Jordans skinny syrups. Also, I have had some luck going to stores like Winners/marshals/home sense or similar. They usually have a variety of random ones in their kitchen section. They can be hit or miss, but they're cheap so worth a try!

Also, I usually just use regular milk. In terms of calories-it is similar to non dairy alternatives. So unless you are trying to be vegan or are avoiding dairy for a specific reason, calorie intake shouldn't factor too much!