I had to go to bed right after the announcement so I missed most of this thread, but has the reaction to the price been more, "Cool, way cheaper than I expected!" or "OMFG rip-off!"?
I'm more of the former; assumming that Nintendo prices these at $2 for 3 stages, that comes out to $.67 per stage, and I was certain that it would be at least $1 per stage, if not like $1.67 (three stages for $5).
There are, by my count, 81 stages in NSMB2, so the included stages are $.50 a piece approximately, and these are only $.67 which is pretty good. This also falls in line with expected retail pricing, where things are cheaper per unit when you buy them in larger quantites (for example, if you buy 4 AA batteries, they are $6, but if you buy 48 AA batteries, they are $8 or whatever).