Seems Philips parts distributor is still allowing us to "buy" 2 sizes of digital video carts for the CD-I. They are expensive, and they probably don't have any left... but maybe...
http://www.encompassparts.com/item/8764 ... ge_-_Small
http://www.encompassparts.com/item/6735 ... ge_For_Cdi
Only $142 or $163 someone buy it and see if they have any left...