There's a MOMs club group in Nampa, I think.
There's a new playgroup that's on Craiglist. The playgroup has a Facebook page, too, and mentions being free.
There was another mom/playgroup in Boise, but I can't find the link to their website. I'll try to do some more digging and see what I can find.
I wish we lived closer to Boise; it seems they have a lot more playgroup or even just kid-friendly activities. Maybe since you live in Emmett, you'll have more access to these sorts of things. Good luck!
That should help