Props? What's a prop?
I say that only in half-jest in that the very first rule of thumb I have when it comes to what I perform now days is that I am not co-dependent on a "thing" such as a Swami, Special Wallet, et al. Though I do use gimmicks it is exceptionally rare. BUT, that does not mean that my inner Pack-Rat isn't coveting the various odds & ends that are available...
I love gimmicks! I love studying this kind of stuff and ponder what went on in the creator's mind as he/she developed the idea, etc.
About the only devices I have with me most frequently would be my Black's Ring, a Copper-Silver Half-Dollar piece for doing the Nightmare Coin story, and at times I have my SUC with me for doing pocket-writing work more than anything else.