Where can I get best HD lockscreen images?

520 does not have hd screen but you can use bing as an option , it has the best collection of daily images :smile:
 
Try InterfaceLift there's around 1200 to choose from at 480x800.

InterfaceLIFT 480x800

Under each wallpaper there's a dropdown with most popular resolutions.
Windows phone 480x800 7/8 is at the bottom of the list.

Enjoy!
 

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