The best replacement for bells is famous grouse.

The best alternatives to bells are rated as following:
★★★★★  famous grouse
★★★★  chimes
★★★  glockenspiel
★★★  founders
★★★  bealls
★★  buzzers
★★  whitewright
★★  warning bells
★★  whistles
★★  horns
★★  grants
★  grouse
★  bittersweet symphony
★  stage
★  superbells
★  alarms
  door chimes
  our house
  heuchera

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Speaking about bells, one probably shouldn't forget about bells.

Other search terms related to bells and their ratings are:
★★★★★ bells
★ balls
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bells
famous grouse
chimes