Companies who make locking ends???

[BluRayFiend]

I've been looking around the internet to find locking ends for my sub cable an I found 3 companies so far KnuKonceptz,Acoustic Research, an Ultralink Im trying to find others but seem to come up with nothing?

I don't want to really go over $50.00 max $75 but from what I see it really looks like slim pickings any suggestions or companies you can think of would be greatly appreciated. I have a monoprice cable now an I really dont care for it I tried a lower end audioquest before that an eh it barely stayed on my sub.

Thanks in advance