MiceDirect has been really good to me so far, my picky guy will only eat dark-colored rodents and I called ahead of a show to see what they had and they sorted out and brought me a big bag of dark colored, frozen rats. .....and of course he still won't eat f/t, but I'm working on it.
My bp is totally fine with me handling him, the only time he's ever been snippy was when I moved him into a new tank and swapped out his old hide with a new one to try to get him to move over the hot spot. I was well out of striking range, it was more like an adorable, cranky pout than a biting attempt!. However, as fine as he is with me, if I give him to anyone else he immediately goes in to ball-mode and won't come out. Even with people who've raised snakes and know how to handle them, yet he's never done that with me. So it really does seem like not only can they recognize your scent they can recognize "unfamiliar human" scents as well.