Both EBWorld.com and Gamestop.com have added the Nintendo DS to their product lists. They currently have the system listed at a price of $199.99 with a ship date of 11/29/2004. Games are currently listed at $49.99, the same price as most new GameCube titles.
Both sites offer the disclaimer that "these prices and dates are subject to change", but early speculation suggests that the price will indeed land somewhere in the $150-$200 range. As for the release date, Nintendo itself has stated that the DS will be available by the end of 2004.
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Think about how expensive console game prices are in Europe and Australia. If Nintendo had higher North American prices they would have REALLY high prices in those countries. Portable games are virtually all they sell in those areas and it would be foolish to completely lose those markets.