Do you have a source? All the online stores I've found sell the hand sprayers empty.
Follow
this link and click "products". It says: "capacity 250 ml", which is no guarantee of course, but the can next to it which contains 1 liter (and which costs 4x as much as the spray) also says "capacity 1 Liter". I could maybe believe it about the empty sprays, but it makes no sense whatsoever selling empty cans, which is they reason I believe the sprays are also filled.

Ah, I suppose those could be filled, given the prices, and sizes of the containers.
This is the closest I see to the same product [edit: for the North American market], just based on description, and it explicitly says there is no product contained in the sprayers.