One of the best places IMO for cartos is:
Cartomizers - DiscountVapers.com because he carries lots of different brands & sizes (don't order the GoGo's, those won't work with your batts!) all at great prices.
I believe your Joye eGo batt is 3.4 or 3.7v, so the LR cartos would work, but not last as long as SR cartos. Dual
coils, I believe, are considered LR. All cartos are disposable though, as mentioned previously, so I personally don't worry about that too much. I keep a large amount on hand, and buy as needed, and it's still cheaper than analogs.
Good luck with your journey!