150€ isn't a lot of money and, if you can get a 7700K and a 3060 for that much, I doubt you'll find something better. With that said, I don't know much about the used market, much less the one over there.
Have you looked for used Steam Decks? It may be another option and can be used like a regular PC. but I don't know if the games you've mentioned run well on it.
Please excuse my bad English.
Former gaming PC: i5-4670k@stock (for now), 16Gb RAM 1600 MHz and a GTX 1070
Current gaming PC: R5-7600, 32GB RAM 6000MT/s (CL30) and a RX 9060XT 16GB
Steam / Live / NNID : jonxiquet Add me if you want, but I'm a single player gamer.







