No u can or can't it depons on what store it is but they usually don't at a ton of stores but yes the do
Ignore the above.
I'm thinking that some stores in Asia might sell Flashcarts, since most countries have banned them and you have to buy them online. So, I would say, no stores around you sell them unless there's a flea market.
I wish I new i need a Supercard DSTWO and can you buy it in a store
Supercard DSTWO is the most powerful 3ds flashcard to play ds games. you can purchase it from supercard dstwo USA official retailer
It is now illegal to import and sell DS flashcards in the UK.
Yes but it is professional software. It requires lots of money.
you need a flashcard like r4 or supercard dstwo i reccomend the r4 sdhc dual core its kinda cheap if you get it from china but you have to wait about 2 weeks
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.
there are many kinds of r4 cards in the market. the most popular flashcrd currently is the r4i gold 3ds card and the r4i sdhc 3ds card. in spite of the price, you can buy a supercard dstwo, it is powerfull. But if you consider the price, the r4i gold 3ds card will be most optional.
Authorized Supercard Dealers.
Because the coding of a GBA game is so different from a DS game, there is no way to do it without a slot-2 device like EZFlash 3in1 or an expensive Supercard DSTwo that has the extra memory built into emulate GBA.
You used to be able to buy cards like the Supercard on Amazon and eBay until early 2010. Nowadays you can only grab them online, there are a number of stores but rather few official dealers - the main one in the UK is NDS-Gear.
Yes
you will have to buy it online somewhere like Amazon.com but i recommend to get the Supercard DS TWO because its got way more features than the R4.