I have a Provari and use cartotanks exclusively. I own approximately 20 tanks from several manufacturers, and my favorite tanks thus far are the
IBTanked - Get Tanked With Us!. I currently have seven of those, each with their own flavor of juice. These are a high quality, rugged, and inexpensive pyrex glass cartotank with prices that start at under $20.
I did a review of these tanks in the following link. I included pics of my own IBTanked's on my Provari. These tanks have become quite popular here on ECF, and many customers uploaded pics of their own tanks in response to my review:
http://www.e-cigarette-forum.com/forum/tank-reviews/349222-ibtanked-pyrex-glass-tanks.html
To avoid confusion, there are two diameters offered at the website. A slimmer 19mm and a wider 25mm tank. (I use the 19mm XL). Both of those two diameters are also available in two lengths, standard (for a 35mm carto) and an XL (for a 45mm carto).
Acrylic and stainless steel endcaps are offered for the 19mm tanks. Only stainless caps are offered for the 25mm tank. Pre-punched and unpunched cartos are sold on the website in both lengths needed, as well as drip tips, a tank accessory tool, and a carto punch tool.




Both the tubes and stainless caps are available in a wide selection of special painted finishes, or the plain natural finishes. The acrylic caps for the slimmer tubes also come in a wide selection of colors and patterns.
Stainless steel caps and pyrex glass are the best medium of materials to use with cinnamon or citris flavors that can crack or melt the polycarbonate plastic of the cheaper tanks sold by other manufacturers. And because these materials are inert, they carry no "plastic taste" over to the flavor in the juice being vaped.