The best replacement for foam core is foam board.

The best alternatives to foam core are rated as following:
★★★★★  foam board
★★★★  gator board
★★★  mat board
★★  gatorfoam
★★  styrene
★  coroplast
★  innerspring
★  sch 40 pvc
★  gatorboard
  inner spring
  balsa core

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foam core
foam board
gator board