That's almost sneaky... a tiny little number hidden amongst the artwork. At least they have a number on their for those who find them in a store... but it still doesn't help with online ordering of these, as I could buy up 20 of them from Amazon and still end miss out on pack 6, or miss getting enough packs to make up a complete set of 16 Arcade Botbots.
I'm still waiting on mine to arrive in the mail.