A truly sustainable object is something that has replaceable and repairable parts.  
Replacement Wicks for Queue & Bolbo lighters can be found here. 
Replacement Wicks for Hard-Edge (flip-top) lighters can be found here. 
Replacement flint for all lighters can be found here. 
If you need help repairing, replacing, or refilling, check out Tsubota Pearl's video series here.