It gets no cheaper then this!
I'm a huge Kanger T2 fanboy. They are the only clearomizer I use now. Ivape now carries the version 2 heads at an incredible price. If you haven't tried a kanger T2 yet - now is the time. You can also buy a Kanger T2 replaceable head clearomizer w/ one head for $3.95.
5 pack of Kanger T2 heads - LR or SR - $4.95
1 Kanger Clearomizer - $3.95
These have been re-branded "Ego Sunfire".