questionswhere can i find them?

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This looks like a good site with a lot of material. Some stuff is on sale:
http://www.otrcat.com/?gclid=CKPclbmfhLQCFayPPAodUH4AKg

This also looks like a good site. At a glance it looks like they are free downloads.
http://www.radiolovers.com/

vote-for4vote-against

Oh, so many sites:

archive.org

radiomickdanger.com

zootradio.com

These are all public domain sites and probably have the same stuff. Some of it sounds horrible, but it's free. You can pretty regularly find cd sets at thrift shops such as Goodwill, the key is to not be too picky about shows.

If you want to spend a lot of money, check out Radio Spirits or the Nostalgia Digest to begin with, but @jsimsace has a good idea with amazon.

vote-for2vote-against

Have you checked Amazon or ebay?