The best replacement for cell wall is cell membrane.

The best alternatives to cell wall are rated as following:
★★★★★  cell membrane
★★★  plasma membrane
★★  membrane
★★  gram negative cell wall
★  bacterial cell wall
★  cell plate
★  capsule
★  secondary cell wall
★  plant cell wall
★  extracellular matrix
  cell envelope
  cytoplasmic membrane
  glycocalyx
  prokaryotic
  no cell wall
  human cell wall
  animal cell wall
  cytoskeleton
  gram negative
  chloroplast
  archaebacteria
  eukaryotic cell wall
  prokaryotic cell wall

Your alternative for cell wall is not listed? Suggest!
Speaking about cell wall, one probably shouldn't forget about peptidoglycan.

Other search terms related to cell wall and their ratings are:
★★★★★ peptidoglycan
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cell wall
cell membrane
plasma membrane