I bought the mail shoulders and chest for when i levelled my shamy and Hunter,
then instead of buying a new set for my mage/priest, i just told the GM that i didn't think of them when i bought the heirlooms and was wondering if they could change them now,

Couple days later my toons were heirloom-less, and i had a bunch of badges and shards in my mailbox :-)
Saved a fair bit of grinding