First and foremost, realize that this is not the 1969 recording done live for Japanese television. Check the catalog number before you buy. I have found three sources for this recording. First is CDMail, in France. The link is on this site.
Shipping can be expensive, but their prices are good.
They don't keep stock, which is good for you because they can order the recording directly from DG more quickly than most stores can restock and fill backorder. The second source is Brodt Music. I don't think they have an Internet site. The last source is CDNow. They have an Internet site.