After several mentions of HDTracks.com in other threads I had a good browse through last night and ended up buying McCartney/Band on the Run set.
It's offered in 96/24 FLAC / double CD either compressed or uncompressed. I went with the latter.
If you register on the site they send you a promo voucher code for 20% off first order. This put the double CD at $15 which I think is pretty good value.

As for the sound....top notch. If yo don't have it in another format it's worth a punt.

cheers

Rgds,
Nick