Is that even a thing? I’ve never heard that being possible before. I would be willing to pay a premium for guaranteed non-commingled products. But Amazon commingles to make their own internal logistics easier.
Or the FBA label service [2] can apply the stickers for you, at 0.15/item
[1] https://services.amazon.co.uk/services/fulfilment-by-amazon/... [2] https://sellercentral.amazon.co.uk/gp/help/external/G2004837...