You can go for free shipping, they estimate that takes 7-35 days.
That's what I went for.
An R4i Save Dongle is a really straight forward way of handling 3DS/DS cartridge saves, but if you have a DS Lite and a way to load homebrew .NDS files on it, then you can manage 3DS/DS cartridge gamesaves with that.
To get the 3DS cart into the DS Lite though will require either the board out of the casing, or filing off the 3DS nib.
Something like a Slot-1 or Slot-2 flashcart should work fine on a DS Lite.
It cannot be a DSi or 3DS though, they took measures to prevent cart-swapping after loading the system, so you can't use cheat devices like before.