Dont really know, i bought many games for ~4€ online or in various stores, used of course.
When it comes to new/sealed: In 2014 a major retailer called Saturn they still had Lumines brand new for PS2 lying around, i got it for 5€ before they completely got rid of their PS2 stuff in bargain bins.
My online systems: Mac M4 Apple sillicon+16 GB, PC Vega 56+Amd Ryzen+32GB DDR4, Xbox Series X, PS4 Pro, Switch Lite, Playstation Vita TV, PS3, PSP
My retro systems: Wii U, DSi, Xbox, PS2, Dreamcast, N64, PS1, Sega Saturn, Neo Geo AES, SNES, Evercade







