Sign up for the greasy lake (Springsteen) forum; theres quite a lot of fan to fan trading at face value.
Rumour is that a further allocation of tickets will be released a fortnight before the show; if you're chilled to wait keep checking the HPC site.
Tickets from eBay are coming in at about £60-70 each for Hyde Park, but significantly more for Springsteen's Glasgow & Dublin dates.
http://www.greasylake.org/