Ok, I think I stumbled upon a pretty good deal last night. Before that, Best Buy has many hd dvds on their website and a few instore for 14.99, so I picked up Fear and Loathing. Then I saw that they had the Matrix boxset for 44.99, and the only version they had on the shelf was the Ultimate Collection.
Now when I went to check out, the Ultimate Matrix boxset rang up at 89.99. I told the girl that it was on sale for 44.99, so she went to the aisle, came back and price adjusted it to 44.99. Good story, well, there's more.
Looking at the BB website this morning for other cheap hd dvds, I see that the Complete Matrix (3-disk) boxset is priced at 44.99 and backordered, while the Ultimate (5-disc) Matrix boxset is indeed priced at 89.99, just like it rang up yesterday.
So, in short, Ultimate Matrix boxset, 44.99, very much YMMV.