The only two monopods that Canon offers are the Canon Monopod 100 and the Canon Monopod 500 Floor Standing Monopod. The Monopod 100 is a discontinued model and I've had a tough time finding one.
The single most important of the monopod accessories is the monopod head. The ball head makes the most sense. Some monopods come with only the traditional mounting plate to attach to the bottom of your camera.
The Canon 100 gets a Canon Camera Geek 4-5 rating of 93% which is a pretty high ranking for such an accessory that is not over-priced.
If you are only supporting a point and shoot camera or a small DSLR a Professional Mini Ball Head Camera Mount might suffice:Professional Mini Ball Head
**The Monopod 100 is essentially unavailable at this time from most online retailers. You may have to go used if you really want to have one.
Both the 100 and its replacement, the Canon Monopod 500 come with ball heads. They are intended for light camera-lens combinations. Some buyers have used sandpaper on the ball head to reduce the tendency for slippage.
The monopod 100 is great to use to stabilize your camera, particularly when you have one of the large Canon Camera Lenses attached or you have a slow shutter speed and you want to minimize motion blur.
Monopods are also good to use when shooting video or stills when you want to follow the action by panning without sacrificing the support. For more stability and even slower shutter speeds, you will want to use one of the Canon Tripods. Tripods are better for stationary object and time exposures.
Both of these accessories are good for reduced neck, back and arm strain.
The ball-head is the single most important of all the monopod accessories to have.
Another benefit of using a monopod: having just a single leg and no center post means you now have an accessory that is less than 1/4 of the weight of a tripod.
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