How to find a MM share group to join

I am going to Disney World the first part of September. :)!!!
However, $149 for the MM is a little steep for us so I would love to join a group that wants to share, but I have no idea how to find a group. Also, I would rather not take a lead on this as I’ve never done it before.
If anyone could help me figure this out I would really appreciate it.

Jump on the September facebook page or post on chat.