Each booster pack consists of 7 Japanese Pokmon cards
Many cards in Avatar: The Last Airbender are straight-up payoffs for playing lessons
Typically from a mix of three channels: Japanese exporter-retailers with international storefronts (the backbone for recurring volume), marketplace and proxy-buying channels (for gaps and small test orders), and Japanese auction or buyback channels (for opportunistic and out-of-print buys)
As far as searching for cards goes, Ive noticed that you are no longer shown every single card that has the searched sequence of letters somewhere in its name, which has been both a positive and a negative
Developed in Japan, the first Pokmon Trading Card Game was based on the 1996 Pokmon Red, Blue, and Yellow Game Boy by Nintendo
unless you want the old-school visuals and wording, in many cases later reprints are less expensive