You know I dont think the tags have been put in for the compatibility to work across the board. Pretty much though compatibility boils down to two things, Diameter and length.
For diameter we have four different sizes, 15, 19 22 and 25mm
tanks. This is how wide the
tank is and is roughly 1/2, 3/4, 7/8 and 1" and the caps in those diameters will fit any length of tube of the same diameter.
For length this determines which cartomizer you will use. We have the Standard and XL which are common cartomizers 35 and 45mm length (40 and 50mm according to Boge as they measure the threads too). We also have the HalfLing cartomizers which are 19.8mm and sometimes referred to as super shorty.
So all together there are 12 different tank sizes, just choose a diameter and length and get the cartomizers by the same name on the length as the Glass Tube you choose, HalfLing, Standard or XL and they will fit.
Sorry on the sale, we set our prices as low as we can so every day is Black Friday at IBTanked
We have talked about trying to do something down the road on something we can do a bulk purchase on and pass along the savings.