Xperia XA2 with 30€
https://m.tori.fi/vi/101271997.htm

Casio Cassiopeia E-105
https://m.tori.fi/vi/108738536.htm


Psion Series 3A
https://m.tori.fi/vi/108513215.htm


Sharp IQ-8100M
https://m.tori.fi/vi/108510908.htm


Ericson MC-218
https://m.tori.fi/vi/107959030.htm

And a lol one. Used N810, only device, asking price 190€!!!
https://www.tori.fi/vi/108498434.htm

I informed th seller that the normal price is around 20€.

Maybe he/she check first this price:
https://www.ebay.com/itm/374084215279

But actually I have ever seen under 40€, even in bad codition and good condition with working battery and charger. It is mostly somewhere 100€

I have bought these in Finland 5 device with 35€ altogether. N900 devices with 25€ or even less.

Yes but private sale means that the buyer decides what he wants. If the price is right, he will sell. If it isn’t, it won’t.

I personally prefer to lower my prices way too much to get rid of something I want to sell, but I can’t blame anyone who wants to make as much as possible.

The problem in this market place is that there wss before devices with such good prices that people bought devices. Then one seller put a high price and that is the one advertise that stays there cause people do not buy it. But then next ones who came to sell to the same market place copied this higher price and no-one buys them anymore. I have been informing the sellers of this thing but normally they just think that I just want to buy with a lower price and I'm trying to fool them.

I’m pretty sure that if anyone wants to sell he will lower the price though.
The older and the rarer the device the bigger the price usually.
Take the N950 for example. Does it worth 50€ as a device? You can get much better devices for 50€. But people payed thousands of euros and keep paying hundreds to this day.

What device is better in every way than N950 in any price?

Any device with 4G, usable apps, active after sales support, so hundreds of smartphones in the 50€ range I guess.
Don’t get me wrong, I do love my N9’s and I play with them when I have time, but they stopped being a usable everyday smartphone many years ago.
Unless of course a call over 2G (if still available in your country) is all that matters I guess.