As far as I've been able to determine, the only Theo Bikel CD is a delightful compilation from Rhino Handmade called Theodore Bikel's Treasury Of Yiddish Theatre And Folk Songs. I checked Bear Family, and they had no Bikel recordings.
There oughta be more.
-Joe Offer-

There are several more beyond what Joe has been able to determine. The ones that I have are:

"Classic Jewish Holiday & Shabbat Songs (Sameach)" and "Theodore Bikel Sings Jewish Folk Songs/Sings More Jewish Folk Songs (Bainbridge)." The latter combines two of his old Elektra LPs onto one CD.

There are others. Check in Judaica stores that sell CDs.

I also have a couple of holiday CDs that Theo shares with other artists:

"A Taste of Chanukah (Rounder)" and "A Taste of Passover (Rounder)."