i'm selling my old flash card at ebay, if you want to buy it, just bid it. put supercard lite at the search bar, and my ID is fishlockracer. or buy it at other web. just google search it.
divineo.com you can buy a slot 1 device like m3 simply that uses micro sd cards if you dont want to play gba roms, if you do, get a slot 2 device such as m3 lite (if you have a ds lite, m3 sd/cf if you dont), as well as a passcard 3. You can also get a supercard which is cheaper but generally not as good
http://divineo.net/ http://www.gameyeeeah.com/index.php http://www.m3lite.com/ http://www.modchipstore.com/
Yes, just buy the Datel Max Media Dock at Wal-Mart for 39.99, you can put movies AND music on your DS or DS Lite.
I really wouldn't recommend any Datel Media docks/media players for the DS as you can easily achieve the same results by buying a device online at a cheaper price. (don't forget the original Datel Media Dock for the NDS was almost identical in hardware and how it worked to the GBAMP, which at the time was less than half the price of the Datel product)