there are different price categories.
£25 - Ticket priority only
£32 - Ticket priority + monthly magazine delivered to home only
£42 - Ticket priority + monthly magazine delivered to home, member gift pack only
£100 - the above plus a framed Chelsea picture and every matchday program delivered.
More info and details here because I don't know if the above it all you get with the packages.
http://www.chelseafc.com/page/Membership/0,,10268,00.html