Can you make up one of your own? I was just thinking, you could cut up real bandages to make them dolly sized, use those droppers you get with baby medicine for a syringe, what else? Do you dye your hair? With the hair dye I use, you get a little plastic pot with the rubber gloves in which would make a marvellous pill box.
We used to have a properish stethoscope, with a metal thingy on the end and rubber tubes - not part of a set - oooh, look here (scroll down) it's £5.99 but it works really well (if you get one don't let anybody tap the listening bit when you have the earpieces in, it hurts!)
I bought dd a real stethescope from ebay. It was only 5/6quid and it's brill - she's amazed by it and it helps when we go to the doctors now because when he wants to listen to her chest she knows exactly what he doing!