Try that local drama club. Also reach out to any other theater alliances or organizations.
Many theater actors have a good sense of commitment. After all, they HAVE to show up or the show doesn't go on!
Also, don't be too hard on yourself, or the actors your working with. I have to say that in my limited experience, getting ten actors together for a shoot can be a challenge, even when you are paying them and planning a few weeks out, never mind week to week!
Here is a link to trailer for one of our short films. You can see a restaurant scene in the there which had four principals (paid) and 15 extras( unpaid) and a bunch of crew. That one day shoot required a lot of coordination in advance to get the actors scheduled.
http://www.youtube.com/watch?v=4VszNqZMZ3o
One more thing. Actors are especially motivated, like most everybody, by what is in it for them. Always have a clear outline of what you are doing and what your intention with the project is.
For instance: I am making this film with the intention of submitting it to film festivals.
Do project confidence and a clear goal. "I am making comedy spoof videos because I want to submit it to such and such web series competition."
Also, actors like artistic challenges to rise to: "I want to make a short film that takes place in one room and has no dialogue."
Best of luck. And, yeah, it's a drag when you have actors who aren't into what you're doing. But keep at it!