It really depends what you are looking for. If you are a private boater and don't need the certification - which in rescue 3 is generally aimed, at best, at commercial rafters, and at worst firefighters and other "professional" rescue personnel. These courses are important but for the private boater the skills you really need to make life saving decisions with your crew on the river will likely not be covered.
I am an instructor so I'm completely biased but these are the best courses for both private kayakers and rafters https://downstreamedge.wordpress.com/
Check out the "upcoming classes" side bar on the left for what we've got soon.