I M A G E S

 

Minitokyo.net
A complete source for Yu-Gi-Oh! and GX images, a lot of downloads are free.

Animepaper.net
The best Yu-Gi-Oh!, Yu-Gi-Oh! GX and 5D's image source, registration is requisite.

Photobucket.com
You can find all images you want, it's totally free.