Where to buy cheapest preflashed dstwo for 3DS V7.1.0-16 in UK?

Just as we knew,dstwo was public regarded as the best flashcart,for its powerful features.It comes with a CPU in the card that lets it run GBA emulators and SNES emulators at (mostly) full speeds and the Supercard DSTwo is the only cart for the DSi/3DS that has never needed a hardware revision to take newer updates.
Now, 3DS Firmware has been updated to V5.1.0-11,yet,dstwo can work perfectly on it, modchipfactory has provided preflashed supercard dstwo,so you dont need any updating yourself,you can buy the preflashed dstwo from here http://www.r43dsworlduk.com/supercard-dstwo-for-3ds3ds-xl2dsdsidsi-xlds-liteds-p-19.html
Though dstwo is the powerful card,yet,it was very easy to operate and following is a detailed guide on how to make dstwo working on 3ds latest firmware
1.Download the latest EOS V1.11 from this page.  http://eng.supercard.sc/manual/dstwo/download.htm


You will get this after download.

Extract it

2.Access the folder to get the eos files

3.Copy the “_dstwo” folder ans “.dat” file on the root of your sd card and also create another folder on the sd card to store games. SO finallt the cart will look like this

4.So just put the sd card and Supercard DSTwo 3DS on your ds console. Turn on

If i update my N3DS by connecting WIFI , will my supercard dstwo be blocked?

In the normal case, if you updated  your console by connecting wifi,the system will update your console to the latest vesion ( v7.1.0-16 ) automatically, if you have updated your 3ds/xl before updating your card,then your card will be blocked.Then you need another console to update your flash kit first. “Never update your console before updating your card”. This word applied to all flash kit.
Yeah,now,here came out a good news that  Supercard dstwo comes with a up to date firmware, which can directly work on 3DS V7.1.0-16 and DSi V1.45 without any updating needed. In a simple word, even if you have updated your console before updating your card, your dstwo can still work well on upated N3DS. You just need buy a preflashed card,then all problem will be fixed. And here is a USA based store, preflashed firmware for you : buy dstwo
And following is a detailed guide on how to update your dstwo for 3ds v7.1.0-16 ( this specially for those users who dstwo card has been blocked )
Step 1 :  Download the DSTWO latest EOS V1.11  from the official site supercard.sc download page

Step 2  After you download it, you will get the zip file

Extract it

Open the folder

Copy all of them into the root directory of your sd card.
Step3 : Download the dstwo  updated patch V1.25, and unzip it,open the folder and copy the root files into your micro sd card as well

Copy this file and also put it on the root of your sd card. so finally your sd card should have the contents below

step4 :  Put your micro sd card into your supercard dstwo and put them together to your NDS/NDSL or DSI or 3DS version lower than V7.1.0-16 and power your console to update your dswo 3ds first

After update finished, you can make your dstwo work well on N3DS V7.1.0-16.