Mark, as you might guess, I have several Carmina Buranas and have listened to probably about 20. Possibly the performance I like best is Ormandy, Philadelphia Orchestra(Sony 87735)which can be found around $7. For the best sound I like Dutoit, Montreal Symphony Orchestra(London 455 290, full-price).
Incidentally, often even stores with a good selection don't have an item in stock. For example, I ordered the Naxos Rachmaninoff Symphonic Dances CD online from Borders and picked it up about 10 days later when they notified me.
