I got one of those, too, for $9.99, and I like it. They actually still have them at vaporrange but only in blue, which is what I had to get a few months ago. If you get the Provari, be sure to check the Specials section. That's where the great deals are for the 2.5, and the extension caps are only $6 right now. I have two minis that I didn't bother to buy extension caps. I didn't see much advantage of moving from a 18350 to a 18490 battery. However, I have also bought three full-sized 2.5s and grabbed the extension for those to work with the 18650 batteries. I love the Provari. It just hits my sweet spot for vaping. Have five now and still keep an eye on the blems that come available in the Specials section from time to time. By the way, don't be thrown by the "blem" designation. I've never been able to find a blemish on any of mine.I must say I am really loving this zmax 3.
ETA: Oh, and please pay particular attention to @choochoogranny's post above. The Provari 2.5 requires a button-top battery. They're not more expensive or hard to find, but you do need to be sure that's what you buy for them.