Here is a link to a good assortment of them. They all use the same heads EXCEPT the Nautilus. Pick you flavor, they have them in Ego or 510 and just about and look or size. I've never used this particular vendor before I just picked the page because it shows a good assortment. I do know it's a legit vendor though, I've seen a lot of ECF people use that vendor.
http://www.discountvapers.com/aspire-clearomizers/
Thank you. I’ll look them up when I get home from work.