i have a Canon EOS M with the 22mm pancake lens. with the 1.6 sensor factor, you get a 35mm aspect. you can get one on ebay with a lens for like $200.

another option is to get an older android phone, put Lineage OS on it, and just never add a SIM.

you get the simple phone camera, and small form factor. i bought a Nexus5x on ebay for like $40.

its amazing to me how well it works.