Hmm... Let's see...
For the DnD gamer, Fiery Dragon offers:
Counter Collection I - tons of the basics, like 20 skeletons, 15 dwarfs, 5 trolls, 20 orcs, 15 drow...
Counter Collection II - the more offbeat monsters, like treants, gelatinous cubes, displacer beasts, wyverns, hell hounds... Plus 150 DIFFERENT PC counters, covering almost every race/gender/class combo.
Counter Pack I: Demons & Devils - All the fiends from the MM, plus lots of fiends from Green Ronin's Legions from Hell and Armies of the Abyss.
Counter Pack II: Tribes, Clans and Cults - A goblin tribe (with worgriders), a hobgoblin army (with general, lieutenants, chaplains and all), an undead horde, a thieves' guild, a knight squadron, a fire giant clan...
Counter Pack III: Denizens of Darkness & Dungeons - An entire drow city, plus enough counters to play Necromancer Games' Rappan Athuk trilogy.
Counter Pack: Dragons - Dragons of all sizes and colors, including wyrmlings, half-dragons, dragonlike creatures like wyverns, cockatrice and others.
For the d20Modern fan there is:
Counter Collection III: Modern - Character classes covering all gender/class combos, plus creatures, vehicles and superheroes.
For the CoC fan there is:
Counter Pack IV: Eldritch Horrors and Occult Investigators - With things from beyond, 20's style characters and new d20 rules for occult setting, the Eldricth Earth.
Check them out
here