I wish there was an indication on the individual pet pages regarding the tradeability of the item that teaches the pets. For example, http://www.warcraftpets.com/wow-pets/me ... al-chicken Mechanical Chicken is not tradeable, but the item, http://www.wowhead.com/item=10398 Mechanical Chicken that teaches the pet is BoE, so it effectively is tradeable. For a collector, this is important to know, so if possible, could this be added to the pet pages?
Even worse, there are pets like Tiny Goldfish http://www.warcraftpets.com/wow-pets/aq ... -goldfish/ that require faction rep to buy from the vendor or use, so you have to know to buy the caged pet instead of the pet-teaching item on the AH. (If you have the rep, you would presumably buy directly from the vendor).