update:
Found some analog agfamatic with a nice viewfinder, give it empty (maybe it even used some proprietary cartridge anyway) it's a big success! Toddler is holding it with the lens in the wrong direction though
I got a metallic blue K-X with kit lens to use as a camera in the living room. The K-R would have been a little bit lighter and better for general use due to OVF leds, but also about 30% more expensive.
K-X is minimum due to ISO going to 6400 with good enough results for small prints, so a lightweight kit lens can be used.
The K-X came with two original Pentax-branded "to be used with Pentax K series" AA rechargeable batteries! Never seen these before, must be 13-14 years old by now... They're still charging!
What's good about AA is that if it goes into the red, the next day they're good for another 10 shots, can easily use them a week near depletion
I'm also trying an optio WP-i, which including shipping ends up at at least about 25 euro for usually, but it came with empty battery despite being advertised as working, which is not the best sign of things to come, will see were this brings me. It has a very sturdy battery compartment, feels light in the hand, I hope it works!
But overall the compact digital cameras are no party so far. Sometimes sold as batches, but can be pretty sure they're defective. Working ones are never really cheap, often sold by people thinking a camera is always worth a hundred bucks, or a model is somehow popular in the retro digicam crowd, and indeed a hundred bucks

---------- Post added 13-02-23 at 04:26 ----------
Originally posted by Wasp
If it must be a "real" camera, this might fit the bill. My hunch is that they are (or should be) cheap and nasty but I have no idea. For all I know it could be a collectible classic...

The lightest, most affordable, still usable, DSLR combo seems to be: the 1000D (at about 70 bucks), or the even lighter 100D (but more expensive), combined with the EF-S 24mm 2.8 pancake (about 120 bucks).
The issue with Pentax pancakes is that they are all so damn expensive, I therefore can get such a Canon body+pancake for half of the price of a Pentax body+pancake.
Don't know the optical quality of that 24mm but just going for cost and weight, the quality can take a drop I think
I might try it out once, hope the shutter times allowed by the f2.8 can alleviate lack of sensor stabilization. For winter jacket coats it might be pocketable, an alternative to a GR