I saw a couple standalones at Walmart the other night.
I think the deal with Amazon is you have scumbag hoarders/resellers working that refresh button, then immediately putting it right back on Marketplace for fifty or a hundred bucks more.
I've seen it go in and out of stock on Best buy.com a couple times today. That would get me RZ points and the GamerZone bonus, so it'd be about seven/eight bucks back.
Kmart is pretty much the best deal I think, but it's not great; I'm leaning toward Target if they have any in stock during sane shopping hours - I get fifteen percent off all purchases which is better than 15 buck game coupon.
I wasn't really all that interested in it - I guess I'm burned on the Wii - but once I started hearing about it and looking more into the post release reviews, I think it would be cool to have. It won't replace a controller for games like Fallout, but for 'family' energetic gaming, I think it would be much better than the Wii.
Longevity is a concern, of course - do they keep churning out virtual pets and exercise games, or are the second/third generation of games actually 'gamer' games? But launch titles are always a mixed bag and sometimes not very representative of the platform potential.