I've got a nice Canon wireless shutter release for sale. Low mileage (only used a few times) and works great. I used it for a group shot where the camera was 50+ feet away and it performed flawlessly. Selling it since I sold the camera already.
It could also likely be adapted to other cameras fairly easily.
This will work with the rebel series, and anything that uses the same such as Canon EOS Rebel 2000, EOS Rebel X/XS, EOS Rebel G, EOS Elan II, EOS Elan IIe, and EOS I, etc.
It's also super easy to adapt this to other cameras if you have any experience with cutting and soldering cables.