If you play on a low pop realm, and want to boost your pet count rapidly, keep an eye on the BMAH. On my realm, I never see any TCG pets on the real AH, but I have been lucky enough to buy a Dragon Kite and Bananas on the BMAH (40k and 50k). Now, it is great that I got 2 TCG pets for ingame gold.
But what I did, was used an alt on Ilidian (very high pop) and I sold the dragon kite for 100k. I was then able to use that 100k gold to buy almost all of the other TCG pets. Not sure how many, but probably 5-7 . I still have 20k left on Ilidian that I am going to use to buy some of the ToT raid drops ones and also probably some of the carp which also are never found on my main AH.
TCG pets on the BMAH are a great way to get gold onto a high population server with a strong normal AH.