I am in a 6 group 1973 Reims C172M with KNS80, 1 x panel mounted GPS, 1 x moving map GPS, VOR, ADF, transponder with Mode C and the figures are:
£1500 Share Price (main owner owns 75% and 5 others own 5% each)
£90 per month fixed cost.
£60 per hour
This includes all all maintenance, 50hr checks, annual checks, hangarage(very expensive!), all fuel, home base landing fees, Jeppensen VFR/IFR subscription, contribution to engine fund, insurance and any other fixed expenses.
Availability is good and booked through a web site which I maintain. Group has been together for about 8 years. I have only been a member for 6 months and am happy so far.
There is a new(ish) book on the market about group ownership by Rod Simpson recently reviewed in AOPA GA magazine. This has good explanantions and tips and hints on things to look for.