PG - $3.95/16oz
VG - $3.97/16oz
Nicotine (100mg/ml) - $10/120ml (but I buy the "throat hit nicotine" which is really cheap -- normal price is about 50% higher)
Flavors - all over the place, but you can find 8/10/13 ml bottles for around $1.50-$2.50
I use an expensive strawberry flavoring (Inawera Shisha Strawberry) and I also still use a little WTA, but even with 3% WTA and that expensive strawberry, mine is around .12/ml to make -- once I'm done with the WTA, it will drop to about .08/ml.
bullcityvapor.com is my favorite flavor vendor; they show very clearly which flavors have any type of diketones -- if they know, and they make an effort to find out. Wizard Labs has 8ml vials of flavors, so you can try out a lot without going broke; ecigexpress.com also has a lot of flavors (their "Signature" line is the same as TFA) and fairly decent prices.
Andria
Thanks for that info, Andria! Not ready to start yet, but really getting excited after reading info from you, @Kprthevapr and @Rixsta. Thanks, all! Soon I hope to be chatting right along with you guys knowing what I'm talking about. LOL