Searched for this and only found stuff on Demonic Runes.
If you're raiding and doing a boss that does some kind of fire effect, if you're about to wipe get into the fire. You'll die, but you wont aquire repair bills.
Here are a few bosses:
- Archimonde's "doomfire"
- Supremus' volcano fire
- Kael'thas' bird fire
If anyone knows any more, feel free to test them and I'll add them up here with credit.This trick must of saved me over 500g in repair bills so far -- Archimonde wipes ftl!