Classic Encounters - 125 Iconic DND Miniatures Bulk Monsters, Unpainted 28mm DND Minis, D&D Miniatures, Dungeons and Dragons Figures Mini Figurines, Fantasy Tabletop D&D Accessories Assembled

This company a few good sets https://a.co/d/0394mW4D

Amazon has giant fantasy themed boxes for tabletop RPGs that are cheap and single piece. Think 100 minis for like $40. This is a premium pack; they get much cheaper: https://a.co/d/0aMATmpB