While I don't disagree that disposing of the sharp immediately is the best practice, I would have to say that the safety locks on sharps have become the industry standard in my region. I also purchase the supplies for my facility (a school), and while I have not actively looked for non-safety needles, I can't remember seeing any from our suppliers. I teach my students to lock the safety with one finger in a single motion and then dispose of the entire thing (this goes for injection and phlebotomy needles).
My only lifetime needlestick came from a needle sticking out of a sharps container that was too full. If that needle had a safety lock in place before it had been disposed, I never would have been stuck.