Source:  TicketsLondon2012

London 2012 Olympic organizers have announced ticket prices for all sports.  

The Equestrian sports prices range from £20 for D level tickets for qualifying rounds to £275 for A level tickets for finals.  

In order to purchase tickets, in Britain, you must submit an application bertween March 15 and April 26, 2011.  If demand exceeds supply, there is an automated random selection process which will allocate the available tickets.

Outside Britain, tickets must be purchased through each nation's Olympic organizing committee.