One of my favorite online sources is thousandsofbolts.com. Their home page lets you click on fabrics according to color groups. If you select a fabric to look at the details, one of the options on the page is "View all (#) fabrics in this Collection," so for instance, if you looked at this fabric:
http://www.thousandsofbolts.com/inde...92&ParentCat=9
you could be sure that the other reds in that particular collection would be compatible.
And Thousands of Bolts has a special $3.95 flat rate shipping until 2/24!
One other vendor I remembered seeing a pretty reds collection is Erica's:
http://www.ericas.com/fabric/galleryinred.htm
Good luck in your search.
Daffy