good luck
Finding the electronic L-grip for RZ for under $100 is a challenge. There are at least 2 or 3 mechanical ones that will work, that were made for RZ/RB, but most of these are heavier, and won't work with a winder attached. The best mechanical one is the multi-angle grip, but it's rather heavy. I wish the electronic one was as well-built as that one, but it's not. However, with the electronic integration, you can use it with a winder or anything else, since it doesnt' require physical placement to trigger the shutter button.
Good luck. it's a great accessory, and really helps when using the RZ handheld.