2 tickets to ballet at EIF (And then, one thousand years of peace) !

I accidentally booked tickets for the same show twice! And we are now looking to sell one pair of tickets. This is the show: http://www.eif.co.uk/preljocaj1 We have the following tickets: Saturday, 18th, P28 & 29 Sunday, 19th, Q25 & 26 Happy to sell either. The value of the tickets is 27 each but happy to sell for 13.50 each