Anyyyyyyyway!
Those filters look very similar to the Aquaones.
As said above, stick with local. If you go into the shops and start to make yourself known without being a PITA, 90% of the time the owner or manager will look after you with price.
Get to know your LFS
Vebas, Aquotix & Midland are my LFS and I try to regular them when I can.
Pacco & Ollie and their staff are more than happy to help where they can. Brilliant shops!!