I also have a micro 4/3 camera with an adapter and a bunch of vintage (70s) Pentax lenses from the Super Takumar range (M42 screw mount). You can get them off

I also have a micro 4/3 camera with an adapter and a bunch of vintage (70s) Pentax lenses from the Super Takumar range (M42 screw mount). You can get them off eBay for under 100$ each in almost-new condition, and they're super fun to play with..