The Acekard RPG is not manifactured anymore. The official Acekard Team also dropped their support for this card. You should definitly buy an Acekard 2i instead.
You can buy them at any official Acekard distributor such as buy-acekard.com
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Neither, Go with an Acekard 2i. The Acekard 2i is the Acekard team's current top of the line card, that will work on the DSi and 3DS consoles as well (the Acekard RPG / Acekard 2's can't do this).
no, you need to buy the new acekard 2i for it to work on the dsi
Check the Acekard website.
You can use the official AceKard firmware, but for more support use AKAIO (Acekard all in one)
The Acekard 2i can be found from reputable shops online that carry genuine cards from verified sources. If you're looking to get genuine cards for your DSi (there are fakes out there), you should do your research online, find a comparison site online and read the reviews.