Adorama (or Adorama selling through Amazon) has the Ricoh WG-M1 for $99.95 in black.
Ricoh WG-M1 Action Camera, Black 08273
It's been down near that price before I think, but now it comes with a bundle. You can choose two accessories: a stake mount, a helmet mount, and/or an adhesive mount (somewhat bigger than the one that comes with the camera, but with a tether point too). These accessories usually run about $20/ on average. The nice thing is that the WG-MI uses a regular ol' ¼-20 tripod screw mount, so that's what the accessories have, rather than the GoPro style connectors. So they might be useful with other stuff.
I jumped on this although I don't do tons of video. I was gonna use an old Canon P&S, but it would likely be destroyed, and so what with the useful mounts I may come out ahead.
There isn't much info out about this camera. It does the usual stuff and seems to have somewhat higher quality stills, if rather fishy-eyed, as is common with these. Doesn't do really high frame rate FPS, and no 4k, but has time lapse and motion detection modes, has a display (usually only on pricier models), works over wifi with a serviceable app, is waterproof to a decent depth without a housing, and seems to produce good video, if not 4k. But it has a rather lame one-session limit of 25 minutes. But it does do looping. Anyway, worth a look if you need something like this.