This exchange bureau is in the city centre and the rate is 2.445. It's 6 minutes walk from JJ Murphy's as well and 10 minutes to the stadium.
http://nikar.net/index_files/Page303.htmAddress: Bulgaria, Sofia, Graf Ignatiev 36, tel (+359) 2 981 79 27
Opening hours: 8:30 am till 7:30 p.m.
Other options:
www.tavex.bg found in the 4 biggest shopping centres in Sofia.
Sofia, Serdika Center, 48 Sitnyakovo blvd. , floor: -1 (across from Picadilly); +359 2 9888 666
Sofia, THE MALL, 116 Tsarigradsko Road blvd., floor: -2 (across from Carrefour's entrance); +359 2 9888 666
Sofia, Mall of Sofia, 101 Alexander Stamboliyski blvd. , (entrance from Opalchenska street); +359 2 9888 666
Sofia, Paradise Center, 100 Cherni Vrah blvd., floor: -1 (next to Carrefour); +359 2 9888 666