Try the stardust clearomizers v2 or v3. Less parts to clean. Just tip in the juice and go. Less leaky than cartridges. I got these with my Ego C and haven't looked back since
They are only $5 a piece and 1 can last you 1 to 2 months. You can replace the wicks on the V3s and reuse the containers. I only tossed my first V2 after 2 months, because i thought that the wicks weren't working as well as they used to. If you are worried about money, you can probably keep washing them under the tap and reusing them till they die 