The Solitude Trilogy

I was wondering about the difficulty that I've been facing with respect towards acquiring a copy of Glenn Gould's three part work 'The Solitude Trilogy'. I realize that it is available via an mp3 download however I badly want a full resolution copy and have discovered only one CD offering. Unfortunately for me, the price attached to the three disc jewel case exceeds my budget considerably though I would have no hesitation buying it otherwise. It surprises me that this set of works has yet to be rereleased or remastered given the nature of its importance. Any good orderly direction would be appreciated.