The best replacement for power conditioner is surge protector.

The best alternatives to power conditioner are rated as following:
★★★★★  surge protector
★★★★★  ups
★★  voltage regulator
★★  power strip
★  isolation transformer
★  battery backup
★  surge protection
★  power filter
★  furman
  surge
  panamax
  line conditioner

Your alternative for power conditioner is not listed? Suggest!
Speaking about power conditioner, one probably shouldn't forget about battery backup.

Other search terms related to power conditioner and their ratings are:
★★★★★ battery backup
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Google Trends

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power conditioner
surge protector
ups