I second the Nhaler recommendation. Just keep in mind that the HV stuff is 12mg. If you want higher, they also have a whole line of 24mg (Nhale/Xhale).
Nhaler has very tasty juices and I really like the $4 sample sized (6ml) bottles. Makes it easy to test before you buy a big bottle.
BTW: the HV 'French Vanilla Coffee' is delicious.