Byleo have just announced they will launch an upgraded version of the Sophia (rebuildable cartomizer). They should be available next week and I don't know what the price will be.

This version 2 does away with the ceramic cup and NR wire. It is said to be
"Better liquid control, more air flow, resistance wire only, more flavor, more space for your setups. Very easy to setup!"

The announcement was made on their ECF thread.