Hands down, your best bet is
http://www.nicoticket.com. They won the "Best of ECF 2013" award for their vanilla flavors (as well as Best Vendor, Best Tobacco, Best Fruit.....) Custard's Last Stand is a very popular vanilla custard flavor, Creme Brûlée (my favorite) and Frenilla (a French Vanilla) are all fabulous. I have had just about every Vanilla out there, but I stopped looking when I found them. Now I just order BIG bottles, LOL. You won't be disappointed, great company with great customer service and super fast shipping.
Malinda