Although the Blizzard store is annoying in that you have to buy these one at a time rather than two or three for the same account, I have managed to buy about half a dozen in the past few days, all for the same character on the same realm. I have been able to put them all in cages - two as recently as 10 minutes ago - with the exception of the most recent one purchased, as there is a 24 hour cooldown on caging of a newly-purchased pet.
1545 pets
Although the Blizzard store is annoying in that you have to buy these one at a time rather than two or three for the same account, I have managed to buy about half a dozen in the past few days, all for the same character on the same realm. I have been able to put them all in cages - two as recently as 10 minutes ago - with the exception of the most recent one purchased, as there is a 24 hour cooldown on caging of a newly-purchased pet.