you can buy form
e-liquid.cn or cloudsofvapor and some others know of 2 other or 3 other us vendors that carry them.
while they are not a supported member we have ordered from them and recieved the orders so thats not an issue.
there are a few versions, there is the 510 regular sized e2 at 2.6 to 2.8 ohms but they have been showing up on the 2.6 side. those are good at lower volts like a riva.ego.hello battery.
there is the 808 regular sized e2 also at 2.6 ohms but they have the 808 in regualr size at 3.0 ohms which is great for 3.7 volts and 5volts, these hold about .6 ml of juice.
then there is the xl version which is almost double the length, they come in a wide range of ohms, form 2.4 to 2.6, 2.6 to 2.8 and 3.0 to 3.2.
the lower the ohm then you need to use lower volts like the batteries i mentioned or using a variable device such as the little sister,or tekkeon tek mod.
the higher ohmed xl are great for 3.7 volts and above. they hold 1.8ml of juice.
They all have a ceramic cup and a very robust coil, they have no filler and work with a wicking system. They dont seem prone to popping and can be cleaned over and over and dry burned as well. many are reporting they last for weeks.
there is no glue or anything funky inside and now they all come with no primer of any kind.
Some have experienced a leak that after many weaks of testing we have concluded its coming form the slits in the cup, this is being addressed by royal smokers and is being fixed.
For now we have used the ptb method to cover the slots, this has stopped the leaking of juice into the cup and has dramaticly increased the wicking process to produce even more copious amounts of vapor and a massive throat hit and much better nicotine delivery. Using the ptb method on the lower ohm'd e2's has also alleviated any wicking issue at 3.7 volts.
My videos of the how to ptb are below in my youtube link along with many other e2 related videos.
At the moment these are still being updated, we are at revision 3 version 2 which removed the primer, fixed any dented connectors that came off of production, and some other fixes.
there is a newer revision coming but that wont be ready for weeks .