I love RBI, but you can get Chlorhex a little cheaper...
http://www.valleyvet.com/ct_detail.h...2-00b0d0204ae5
http://www.vetamerica.com/chlorhexid...-2-gallon.aspx
And here is something else that someone claimed worked. I have not tried it. Maybe if someone else is using it, they will speak up...
http://www.valleyvet.com/ct_detail.h...4-f48303cb07b4
Rob