We booked a taxi in 2013 from Sofia Airport last time through http://www.viptaxi.com.mk. No money to pay up front and they were fine. I am sure we were under Euros 100 each way way last time although I see the price has increased a bit since then.
Had to buy a ticket in the public sale as I missed the SSC deadline. £35 for West Stand ticket plus £3 booking fee and £2 postage,
This pricing does nothing to encourage any sort of decent crowd.