Where can i buy a shoe knife?

like the KGB had shoes that knife blades popped out and they would kill people with. i dont want it to kill people with i just want it to show off like when i go to my friends house i can pop it out and show him. but where can i buy some, and do they even sell them? be serious, no dumb answers please. like a real shoe. also i dont know where to post this so if i should put it in a different category tell me what one and i will.