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mmm-mode is available on Melpa.
`M-x` `list-packages` `C-s` `mmm-mode`
`M-x` `package-install` `mmm-mode`
suggest that it's not.
How do I install mmm-mode (through MELPA)?
You have to add the melpa repository to your package archives.
In your .emacs init file you have to add the following lines:
Then, when listing the available packages, you will find mmm-mode:
C-h v user-init-file [RET]
Required, but never shown