How many orchestral versions of "Pictures at an Exhibition" do you have in your collection?
The answer is "Too many", I suppose :)
But here you can find 2 very rare recordings - never on CD (?) - by two great virtuoso conductors (and orchestras).
Dorati: studio recording on Philips (1953)
Reiner: live broadcast - NY (1960)
Flac - reup
(see comments)