PetShoppingList monitors your Pet Journal for changes and silently keeps an Auctionator Shopping List (other auction house addons will be supported soon!) up to date with all the missing Battle Pets that can be caged and bought on the Auction House.

Usage:

Simply visit the Auction House and load the appropriate 'Shopping List' Supports:

Auctionator - Click the Auctionator "Buy" Tab at the bottom of the Auction House window. The shopping list should be on the left hand side. If the shopping list does not appear then search the AH for {Missing Battle Pets} and it will remember your search for next time.
Other Addons - You can manually export the data to other addons (see the /petshoppinglist command below)

You can also type /petshoppinglist to display a popup list of all the missing pets, which can be copied and pasted.

Known Issues:

Some Pet names are short and some Auction Addons may not do an Exact Match search on the AH. Some examples include:

If [Clockwork Rocket Bot] is in your list then [Blue Clockwork Rocket Bot] will appear in the results
if [Legs] is in your list then some armour may appear
if [Firefly] is in your list then some armour items may appear

These can easily be ignored, however I am working on a fix.

Future Features:

Auction Addons - If you have a favourite auction addon that you want supported, let me know the name of it and I will try to add support for it. Exclude List - the next version will feature an exclude list, or likely an entire GUI for selecting and deslecting certain pets based on their type, source, etc