What is the best way to find models for TFP?

join a meetup group

OP, looks like you're familiar with posting casting calls.  Have you checked ones seeking for a photographer and travel/availability notices?

Or contact a few local models active recently.  Though, MM last activity is screwed up right now so the list may be small.  Example:  It's still me showing last active June 11.

Also, try contacting an agency.  You never know.