What is your personality, plus how handy are you and what is your cheapskate factor?

No handiness and/or have no budget concerns ever - go with a variety of the Silhouette blades. $10 each, I think.

Mild ability to troubleshoot and desire to save: CB09, about $1 each. I personally have this specific one: https://www.amazon.com/gp/product/B07D838BHJ

Risk seeker: uses cheap Roland style blades, holder is a bigger upfront cost. I haven't jumped on it due to the lack of reviews and lack of need on my end. https://www.amazon.com/gp/product/B09PV7H11K

Tinkerer and possibly ultimate cheapskate: Roland holder with 3d printed holder (requires modifying the roland holder too). About $.30-40 a blade. https://www.amazon.com/gp/product/B07P8DMC2J and https://www.printables.com/model/44721-silhouette-cameo-4-adapter-for-roland-blade-holder