The best replacement for canon 100mm macro is tamron 90mm.

The best alternatives to canon 100mm macro are rated as following:
★★★★★  tamron 90mm
★★★★  60mm macro
★★★  sigma 150mm
★★  tamron 90mm macro
★★  sigma 105mm
★★  tokina 100mm macro
★  sigma 150mm macro
★  zeiss 100mm macro
★  nikon 105mm
★  canon 60mm macro
  sigma 105mm macro

Your alternative for canon 100mm macro is not listed? Suggest!
Speaking about canon 100mm macro, one probably shouldn't forget about extension tubes.

Other search terms related to canon 100mm macro and their ratings are:
★★★★★ extension tubes
★★ kenko extension tubes
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canon 100mm macro
tamron 90mm
60mm macro