At Amazon.com, 104 mp3 tracks, 10 cds' worth, of Ormandy-Philadelphia recordings for $9.99. The selections are not identified by composer but there seem to be a good many complete symphonies and other works, as well as the tidbits one might expect in a collection like this.

If you're not a classical music lover but are curious (and at ease with managing and listening to downloaded music), this would be a great place to start--I mean, it's less than the price of one CD. I don't know how long it will be there. Or if it's available outside the U.S.