...I have wasted some of mine, due to foolish curiosity. There are various ads on ebay for cheap locking tuner sets going for around a tenner or less, generally posted from China. I ordered a couple of sets just to see what the reality is - the pictures make them look very similar to decent sets sold by Northwest Guitars/Vanson Guitars etc. of which I do have good experience.
But is it a case of avoiding the price mark up, and getting the same quality for less, by cleverly bypassing the middleman? No! - what you get is a waste of time and metal. Yes they work, just about, but look really cheap, and are utterly horrible to use. I would post pictures, but I've already binned the offending tuners. Just in case anyone else is wondering anyhow, learn from my mistake.