NGroove if you're referring to the Motown The History set, you can see them all here https://www.flickr.com/photos/cookep...57634220097120

The complete boxed set turns up from time to time on Ebay and Amazon plus Discogs. Typically expect to pay around £69 to £99 for the set these days. However, individual volumes regularly turn up on the various sites mentioned above and on Music Magpie [[similar to DClutter in the US). Individual volumes only cost a couple of quid [[£2) ish and that's how I collected them all - the hardest to find was 0715 Boogie Down [[530-715).
Each CD comes with copious notes from Sharon Davis and also Gordon Frewin and some rarer versions are included. Sound quality too is great.

On the Ultimate Series, the sound quality is also excellent and in mono where the singles were mono. That's a great series also.