๐๐ฎ๐ฟ๐ฒ๐๐๐ผ๐น๐ผ๐๐ฒ ๐๐๐ถ๐ฎ๐๐ถ๐ผ๐ป ๐๐น๐๐บ๐ถ๐ป๐๐บ utility knife, EDC Auto Box Cutters Retractable Heavy Duty Cardboard Cutter, Replaceable Blade Pocket Knife With Clip, With 5pcs Spare Blades - Amazon.com
Otf : r/chineseknives
Here's an OTF auto knife for sale on, wait for it, Amazon. It's probably junk and I'm pretty sure it violates Amazon policy but here you go. Link is in comments. :