Here's a source for flavors:

[Woodsman]

I found these in the local health food store. Raspberry and strawberry are natural flavoring in a base of glycerin and water. Other flavors vary. Here's the website:
http://www.frontiercoop.com/learn/features/bakingextracts101.php#

 

[AmandaD]

You may be disappointed with those - most flavorings in grocery stores are very dilute compared with the ones we use for vaping!