The carrybag...

...So one of my favourite scenarios to play, since I don't have a clinic and often do exams in a motel, is the doctor visiting a sick patient in her bed at home. For this, I usually bring a bag with instruments that I can lay out on the table beside the bed. Typically I bring latex gloves (country doctors use hands, but I'm a 21st century man), stethoscope, speculum, lube, a lab coat and any other toys that the patient might want.

I'm curious - what do other people bring as their play set and where can I find one of those old carrybags that doctors used to have when visiting patients at home?

You may find an original genuine "black bag" at an Antique dealer or sale, flea markets, etc. It will likely have someone else's initials on it but that can be easily changed of course. In many cases they may not be a real antique and simply "old" so you may be able to negotiate a better price if it is newer.

Medicaltoys.com has a nice classic black Doctor's bag

That is a good alternative if you prefer a new one however there are always plenty of Schell Emdee's on eBay for less. In some cases you may even receive a few instruments as well. There is a certain aura of "experience" with well maintained leather that is hard to achieve with a new bag.