Chun Li's stage. The screen where you first see the lanterns up top, that shoot the orange fireballs and you have the rollerblader on the bottom that jumps to the middle platform.
Go on the BOTTOM most platform, where you can see a one up... Scroll over to it, and walk backwards until the rollerblader spawns... Kill her, and she'll INSTANTLY respawn again. Just Keep killing her, and in about 5 minutes I nabbed tons of 1 ups. So have fun.