I normally don't announce vendors - but these guys approached me, and I thought they looked interesting. What got my attention was that they said they have over 1500 flavors in stock! They're an American outfit.
Some of their pricing looks good, but I must admit, I only skimmed each flavor brand. I'm sure they're open for suggestions!
Anyway, I put them on the resources page, and on the flavor detail pages of the flavor brands they carry.
Check them out: DIY Vapor Supply
If you order from them, be sure to get 10% off with the code: ELRECIPES