Soda stream and 2 cartridges (Kingston)

Soda stream and cartridges. Given these by a friend who moved away about a year ago but we have not used it. I am not sure if the cartridges still have contents, but my friend said they can be exchanged, I guess at a location that sells them.
 Easy front porch pick up in Kingston. Just tell me what day you will pick up and I will put it all out the night before, you can pick up any time that day.