Ok guys you HAVE to check this out! This is a brilliant Instructable by Instructables user max mulholland on how to build your own MK6+ cartridge heater for under $1! Look at how simple the parts list is:
Parts
hookup wire
30-31gauge coated nicrome wire
kapton tape
solder preferably high temp
1/4" OD copper tube
furnace cement
Tools
file
scissors
tooth pick
lighter
Check it out for yourself here!