R4 Deluxe won't works with your NDSi XL , it's only for ds/ds Lite .
I recommend R4i Gold Wood Compatible , with this cart you'll get 99% compatibility . If you need extra features like real time save etc , then pick the Supercard DSTwo .
Lightake.com if you don't know any reliable sites. Pay for fast shipping if you wanna get it in a short time since bad weather delays the shipping .
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