Not sure about DSi, but it will need a launcher due to it being primarily made for DS Lite. But if you want to get one for your 3DS solely I would go this one as forwarders work. For website I would use the one I linked, because it's GBATemp sponsors. But yet again before buying remember to look into what you want to get.Will it work on 3DS with or without the DSTT launcher?
Will it work on DSi XL 1.4.5E?
Could you link me a website who sells it and ships from EU?
Thanks a lot