Yeah, if you are bummed on the price, but still want locking, Kahler makes a behind the nut string lock/clamp you could use in conjunction with a regular Earvana nut. You'd have to get it aligned nicely to avoid the strings binding up in the nut slots, but it would work fine. I have a luthier down the street from me and he was suggesting this when I was complaining about the price of the Earvana Floyd nut, and that was when they were somewhere near $160 USD. He said that he had a few guys that just didn't wanna swap their regular nuts for a locking Floyd when they had trems installed and this was what he did for them with no problem or return. Also, if your tuners are inline with your nut slots, then locking tuners would be an OK option, providing they have straight pull.
