Wizards of the Coast General Miniatures by WizKids
Icons of the Realm: Monster Menagerie I Single Booster

Icons of the Realm: Monster Menagerie II Single Booster

Icons of the Realm: Monster Menagerie III Single Booster

Icons of the Realm: Monster Menagerie III Booster Brick

Icons of the Realm: Classic Creatures (from 3rd party seller)

Icons of the Realm: Waterdeep Dragon Heist Booster Brick

Icons of the Realm: Tomb of Annihilation Single Booster

Icons of the Realm: Tomb of Annihilation Tomb and Traps Set

Icons of the Realm: Tomb of Annihilation Booster Brick

Icons of the Realm: Storm King's Thunder Single Booster

Icons of the Realm: Storm King's Thunder Booster Brick

Icons of the Realm: Chief Guh (Storm King's Thunder)

Icons of the Realm: Rage of Demons Single Booster

Icons of the Realm: Rage of Demons Booster Brick

Icons of the Realm: Elemental Evil Single Booster

Icons of the Realm: Elemental Evil Booster Brick

Icons of the Realm: Tyranny of Dragons Single Booster

Icons of the Realm: Tiamat (3rd party seller)

Icons of the Realm: Bahamut (3rd party seller)

Wizards of the Coast Dungeon Command Miniature Sets
It should be noted that all of the Dungeon Command sets are out of print, and are therefore rather expensive unless you get extremely lucky, or purchase incomplete or damaged copies. They are mainly listed for collectors, and are no longer suggested as a method of obtaining miniatures for regular gaming.

Dungeon Command: Heart of Cormyr

Dungeon Command: Sting of Lolth

Dungeon Command: Tyranny of Goblins

Dungeon Command: Curse of Undeath

Dungeon Command: Blood of Gruumsh

Reaper Miniatures
Dark Haven Legends series - Unpainted metal 25mm Heroic Scale fantasy miniatures, ranging from player characters to monsters and more!

Pathfinder Miniatures series - Unpainted metal 25mm Heroic Scale miniatures that are officially licensed by Piazo Publishing, featuring the races and monsters from the Pathfinder RPG!

Warlord Miniatures series - Unpainted metal 25mm Heroic Scale fantasy miniatures based off the Warlord battle game!

Savage Worlds Miniatures series - Unpainted metal 25mm Heroic Scale fantasy miniatures that are officially licensed by Pinnacle Entertainment Group, featuring races and monsters from the Savage Worlds RPG!

Bones Miniatures series - Unpainted polymer 25mm Heroic Scale fantasy miniatures that are ready to paint right out of the box!

Chronoscope Miniatures series - Unpainted metal 25mm Heroic Scale non-fantasy, multi-genre miniatures that are great for sci-fi, modern day and more!

Master Series Miniatures - Unpainted metal 25mm multi-scale, multi-genre miniatures that require assembly.

Legendary Encounters series - Pre-painted plastic 25mm Heroic Scale fantasy miniatures, ready to go out of the box!

Special Edition Figures - Speciality figures in a variety of mediums, some painted and some not, from a variety of genres!