Three breeders that I have ordered from and really have extreamly high quality fish and excellent shipping is
Macs Discus: http://macsdiscus.com/
Discus Madness: http://www.discusmadness.com/
Rocky Mountain Discus: http://www.rockymountaindiscus.com/
The first two have huge selections of colors and sizs. Discus Madness has very good color pictures. I have had fish shipped from all three several times. Great customer service and first rate fish!