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. :
Top 10 Best OTF Knives - Knife Life
Everyday Carry Combat OTF Knives | BLADE ADDICT
Pentagon OTF - Blackout | Professional Use Automatic Knife
Kershaw Interstellar Pocket Knife, Black Manual OTF Tanto Blade with Serrations, Blackwash Finish with GFN Handle, Bottle Opener & Deep Pocketclip - Amazon.com
Everyday Carry Combat OTF Knives - MEGAKNIFE
Pentagon OTF - Blackout | Professional Use Automatic Knife