So I use a Joye-510 and a T-rex e-cig. I have been using the soft top cartos that I by from Kingpincig.com. Some of them don't seem to work well with the T-rex. So i'm open to trying out some different venders. I have used the newer joytech cartos (hard back ones) but they tend to leak alot and i loose alot of liquid, its gets all over everything. I want to stick with the soft top. Any suggestions on good affordable vendors?