You get the odd card bundled with consoles on ebay here too. They don't blatantly advertise the fact in the item listing, you just need to read carefully and look closely at the pics.
Used cards aren't terribly difficult to find, but just about any card in production (including Gateway/SKY3DS) can be bought new through a domestic store here. It's just the slot 2 carts that are really rare used, and impossible to buy new here atm.