The best replacement for b31 is b40.

The best alternatives to b31 are rated as following:
★★★★★  b40
★★★★  b130
★★★★  k10
★★  b30
★★  b48
★  elite 40
★  keurig b60
  keurig k10
  keurig mini
  b44
  keurig b40

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Google Trends

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b31
b40
b130