However, a note on pricing of "5 blade packs and 8 packs blades".
5 blades currently cost 12.99, which corresponds to 2.60 per piece
8 blades currently cost as a selection in this offering 26.99 corresponding to 3.37 per piece.
Since it actually should be the amount of discount that the unit price drops as soon as you buy more So here is my suggestion for this product:
Power either the 5-pack more expensive, or even better: The 8 Pack cheaper.
I have now in any case brought 2x 5 blades for the price of 8 and saved even 1 Euro.
Greeting