A good place to buy your Acekard 2i is from shoptemp.com It's where I bought mine. And their prices are reasonable.
http://www.acegamestore.com/ Maybe not the cheapest, but they have 2 walk in stores in Victoria as well as shipping. Good bunch.
a good place is http://www.ozmodchips.com/ but they only sell 2.1 for some odd reason maybe look into the new supercard ds 2
Mine still does the 2.i. My guess is because nintendo clamped down on the sale of the 2.i because it works on the dsi and hurts sales. Also it seems my store is even cheaper than yours, 2.1 from ozmodchips is 43.50, mine says 35... I still prefer to walk into mine than order-though it offers it
Just to say It's 2i Not 2.i Anyways Ozmodchips does cost more than other places. Some places you can get Supercard DStwo for $40 AU while Ozmodchips is $70 Au for it.
I only call it the 2-point-i because the formers is the 2.1 And that's what I noticed about ozmodchips, was tempted to buy from them...but no. I didn't have the ability to buy online when I found ace gaming store, so it worked out good just walking in (Also a few stalls In rumbles and ritches market aka laverton market)