I thought rider insurance was included on an event like Great Vic - but like weg - I looked in the terms and conditions and can't see it.
The following organizations are ones that I know of that offer rider insurance. The policies and prices differ, you'd need to do some research to estimate which might give you more suitable cover.Cycle http://www.cycle.org.au
has membership that includes insurance from $155 for "Alloy membership"Cycling Victoria http://www.cycling.org.au
offers membership to a club, and a "recreational licence" that includes insurance. The price varies a bit depending on which club you join, but around $100.Bicycle Network http://www.bicyclenetwork.com.au
has membership that includes insurance - $122 per person, a family of 2 for $153.