It is best to contact the customer service department at https://helpcenter.galaxus.ch/hc... directly. Then your enquiry can be examined individually. Or, with a bit of luck, someone else will answer your question.
This is due to the different availability and the associated purchase prices. The difference is therefore quite small and the large bottle is very favourable in comparison.
The product mentioned is offered by a third-party trader via our platform, on whose prices we have no influence. They can also increase or decrease their prices independently.