The best replacement for mk520 is mk320.

The best alternatives to mk520 are rated as following:
★★★★★  mk320
★★★★  mk710
★★★★  k800
★★★★  microsoft 3000
★★★  mk260
★★  mk360
★★  wireless desktop 3000
★★  mk550
★  mk330
★  microsoft 2000
★  microsoft 800
  mk270

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Google Trends

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mk520
mk320
mk710