How would you, a DM, handle this?

One of my players (the wizard of course) sent me a list of about 12 items in the book which he wants me to make available in shops, on bodies or dungeon loot. Most of these items are legendary, very rare or rare which would take up a lot of the available items per campaign. I want my players to have fun but also I want to make them work for what they get and of course not have them ultra over powered at a low level (they're lvl 3). How would you DMs handle this situation?