Phil the 100 track box set is going for £45 on Amazon from an Amazon seller at this very moment,a lot cheaper than buying all the repertoire cds,ive just checked the prices on Amazon,im absolutely flabbergasted at the prices that are being asked....bloody ridiclous!!!!
You can find most of the individual Repertoire CD digipaks new or used like new on Discogs.com for far more realisitic prices. Though I would agree with Stuart that the 100 song anthology set would be the 'best buy' option as it includes pretty much everything worth hearing in one place.