I have 3 different clones, and an Authentic which I recently purchased, Both Yeahsmo, and Tobeco make decent clones of it, Tobeco being the best of the three. Even the $9.00 Fasttech clone is functionally identical to the OG. I would suggest buying an authentic used as I did, some real bargains can be found since most everyone wants the newest version.
If you are unable to get the authentic the above mentioned clones are pretty decent.
I've had no issues with any of the clones, or the authentic. I will also add all of them vape exactly the same. I do know that many had issues with the one FT sells, mine had none of those issues. Kanvape as of this post does have some Tobecos in stock, unfortunately the sale they were running just ended, it was 30% off of the current price which is $17.95