The cheapest I've seen it (Capture NX2, that is - dunno what the difference is between it and Capture NX: I presume that NX2 is just the current version) is £130, right up to
£150.
For that kind of price, unless you were
desperate for U-Point technology, I'd go for Lr 3 myself.
Mind you, Photoshop Elements 9 comes in at
£62 and that gets you the most up-to-date ACR, which - and I speak as someone who has always
hated RAW conversions from Adobe products - is
brilliant, using the same underlying demosaicing algorithm and NR functionality that Lr 3 uses.
If you fancy trying something different though, at least as a stop-gap (although it's way better than just a stop-gap) the free
Raw Therapee still impresses the hell out of me, and with Release 3 I'm seeing some of the best conversions I've
ever had.
It's pretty "hands on", and the user guidance material is pretty much non-existent (until I write it, that is!), but it produces brilliant results - and gets better literally every day. It's
extremely feature-rich. I know my way round it pretty well, and would be able to help with any questions should curiosity get the better of you and you give it a go.
It is rather unstable on some machines though - it's still at the Alpha stage of development - but a robust Beta version shouldn't be long.