yes u can get them at best buy
yes you get the AR cards with the 3DS. You can get a 3ds card to play free ds games on Nintendo 3DS.
you can play with them on the 3DS.
All r4 3ds cards can directly support dsi console. No need to do anything. Just insert the r4 3ds card into the dsi console, it can be read.
Yes, the six AR cards do come with the Nintendo 3ds
Trading cards will not work in 3DS console.
All r4i cards work on 3DS. But you need to understand that the R4 cards does not work on the 3DS 3D games and only for DS games. For the first generation R4, it does not work on the cards, please refer to 'R4i cards' , 'Acekard 2i' , ' M3i zero'.
The cards come packaged with the 3DS, but if you lose one you can print it out at the link below.
you can buy prepaid 3ds card from some online store. they can ship to all over the world, including USA. There are many kinds of 3ds cards in the market.
It will fit, but it will not work on the Nintendo 3DS
there are a lot of online sites to sell those r4 cards, just be careful of the R4 clone cards, there are many cards called R4 in the market, if you plan to buy a r4 card for your 3DS, i would recommend you buy r4i gold 3ds or supercard dstwo, both of them are working great on your 3ds.
No, the AR cards were designed to work with the 3DS only.