I've now got my EF 70-200mm F/2.8L USM And I'm looking for a rifle grip to help with stability, I can get usable shutter speeds hand holding, but I really fancy one of the rifle grips that I've seen but I can't seem to find one compatible with a Canon 20D and was hoping that someone knew what I could expect to pay for one and for it. I could try making one of my own with a remote release and other stuff, but I'd really rather have one that works perfectly. I'd like it to be from the UK and my budget would be £150. Ideally less. Any ideas?