Does anyone have favorite sources for buying their secular homeschooling supplies from?

I am an Usborne Books and More independent consultant, so I buy some things through them.  Mostly, though, I just pick and choose from various sources.

Unfortunately, public school textbooks are the only truly secular supplier I know of. You could try Calvert or Oak Meadow though. They are secular

For workbooks, I have been buying things from Evan-Moor, Teacher Created Resources, School Zone, and School Specialty Publishing.  I also use software - Click n Read Phonics, Timez Attack, Study Dog, Reader Rabbit, Edmark.  For DVDs, all the Leapfrog DVDs - Letter Factory, etc.  Also the Bob Books.   All of this is elementary stuff as my oldest is starting grade 1 materials.  But some of these companies - the ones I listed for workbooks - also publish quite a lot of stuff for higher grade levels.  These are not specifically for homeschooling, but still very useful.