There are 11? free sites on the Gale River Rd loop, starting with #1 near the Trudeau Rd/Five Corners end. The last one (#11) is just east of the Garfield Trail TH. There are a couple up the left fork past where you take the right to get to the Galehead parking lot.
But with the closure of the fee campgrounds, it will be next to impossible to get one of these sites, or the ones on Haystack Rd (North Twin). *Maybe* if you go up on Thursday afternoon. They all tend to be full on Friday night even w/o the recent shenanigans.
I know free is always better than pay, but you might want to cough up the small dollars to snag one of the last 4 sites at the Dry River Campground.