The best replacement for plexi is jcm 800.

The best alternatives to plexi are rated as following:
★★★★★  jcm 800
★★★★★  lexan
★★★★  jtm45
★★★  jmp
★★★  bassman
★★  glass framing
★★  tweed
★★  acetal
★★  super lead
★  2203
★  plexuses
  jcm
  jtm
  vintage modern
  jcm800

Your alternative for plexi is not listed? Suggest!
Speaking about plexi, one probably shouldn't forget about vintage 30.

Other search terms related to plexi and their ratings are:
★★★★★ vintage 30
You have in mind a companion for plexi and it is not yet here? Propose!



Google Trends

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plexi
jcm 800
lexan