Benchmade and Spyderco are both offering high-quality trainers that fold and everything so you can train a whole response from draw and opening all the way to closing and throwing in the river (if you want to).
Of course, you pay for these about what you'd pay for a "real" knife. But why shouldn't you? The materials are all the same. The manufacturing processes are all the same except for sharpening. But, in a factory with machinery and jigs and all, sharpening takes less than five minutes. So, there's less than five minutes of labor difference between a good trainer and a real knife.
Belive me, these trainers add a whole new dimension to training experience and are well worth their price.