The Nokia Lumia 620 costs a bit more than the Nokia Lumia 520, which is priced at £120.00 ($182 USD). With the small difference in price, the Nokia Lumia 620 includes a front-facing camera, NFC support, and an LED flash. It's not all good, though. The lower priced Nokia Lumia 520 has a larger screen, longer lasting battery, and will get FM Radio functionality following the Windows Phone 8 GDR2 update, unlike the Nokia Lumia 620.
source: Phones4U (1), (2), (3), (4), AllAboutWindowsPhone via WMPoweruser