The best replacement for e3 is e5.

The best alternatives to e3 are rated as following:
★★★★★  e5
★★★★★  ngk
★★★★  t3
★★★★  pulstar
★★  e30
★★  e4
★★  iridium
★★  e1
★★  ces
★  gdc
★  h1b
★  ds3
★  e620
  e4 office 365
  iridium spark plugs
  e3c
  bosch platinum 4
  e2
  comic con
  pax
  e510
  cobra ode

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Google Trends

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e3
e5
ngk