Good value made-in-Japan kiridashi knives from Olfa. Both knives under £10. Blades edge is precisely ground. Used a file to mod the thumb wheel to give better grip. Got these in UK
Olfa CS-5 Multi-Tool Utility Knife
Olfa 34B Craft Knife | Knife, Craft knife, Olfa
Olfa Stainless Steel Craft Knife CK-2 | Pro Atelier Plus