Birdy

Cowboy Bebop

Dragonball

Flame of Recca

Gundam Wing

Hunter x Hunter

Inuyasha

Mononoke Hime

Oddments

Outlaw Star

Ranma 1/2

Rurouni Kenshin

Trigun

Yuu Yuu Hakusho

Repro but worth it
I don't have many repro cels in my collection (at least knowingly) but I couldn't resist this one. Truly a classic Killua expression.
 
Added: 11/1/07 From: Celga
 
Repro but worth it