I ordered them from Clouds of Vapor a few weeks ago, and absolutely love 'em!
I'm on only my second one. The first one lasted about four weeks, then stopped. I may have damaged a wire while trying to fill it with a syringe and needle. I was pressing pretty hard, trying to get the needle into the tube, when I realized that it was being held back by a black wire! After I was done filling it, I tried it and it wouldn't turn on!
Oh, well. At only about $2.00 a peice, and having about ten of 'em, I tossed it, and put a new one on.
I went to Knotts Berrry Farm (amusement park out here in So. Cal) about two weeks ago, and took along my ProVari, fully charge battery, spare battery and full clearomizer, plus a spare, also full clearomizer.
Well, left home at around 8am, and spent the entire day and night at KBF... I didn't end up replacing the battery OR the clearomizer the entire time! I was floored that a.) the clearomizer lasted me all day and b.) I didn't have to replace the smaller 18490 battery in my ProVari!
Another option I JUST received is the Smart Carts. They're a bit messy to fill, they don't last as long, but they DO provide GREAT flavor! Perhaps more flavor then the Clearmoizers.... down side is, you need an atomizer with them.
Both are excellent options!
By they way, Clouds of Vapor will notify you when they get them back in stock, if you sign up to their website and click on Clearmoizers, then on the "Notify Me" button! Nice feature!