Chris, i presume if you want to use canon IS binos on it - i would leave the IS on when using it. For cameras i have left it on as well because i usually am not so steady
Garrett optical in the US have a reasonable one here
http://www.garrettoptical.com/category-s/54.htm - it is either $60 or 70 US depending on the head, but can carry about 4kg
this one is big enough to use standing if you aren't a giant.