By rebuildable do you mean "replaceable" coil heads, or actually re-wiring the existing coil head yourself?
Clearomizer
tanks which have
replaceable coil heads are the Aspire line of clearomizers, the Kanger line of Evod and Protanks, the Innokin line of iClear tanks, and Vision Vivi Nova tanks. The replacement coil heads are roughly $2 - $3 each and should last 1 - 3 weeks.