Lead generation advice?

[Brad Miller]

Newly licensed in GA and looking for different or unique ways to generate new leads.  Things I am doing so far:

Hosing open houses for other agents in the office.

Sponsoring neighborhoods on Nextdoor (much cheaper than the big .coms).

Using my 'sphere' to work with family and friends.

Joining local cambers to source leads

Joining groups on Facebook 

What other cost effective ways would you advise sourcing leads for buyers and sellers?  Thank you in advance for any help or suggestions.