[Dorothee Jöllenbeck-Pfeffel]

I have payed 7,76 Euro for each .. the real name is: Stricker Dip Slide Combi Bacteria Test Water Bed (Combi because the back side has a fungi test).
If you search in the internet for the product, you will find it on a big american internet trading platform … ;-).
If you can get it anywhere else more cheap, I don’t know…