I hate starting one of these "I'm bragging before buying" threads, but I found about 10 complete Phillips CD-i titles and a controller in a thrift shop. The Zelda game with Zelda herself on the cover was one of them along with Mad Dog Mcree and a casino game. I can't remember all of the names, so I won't try to list them here. This is a thrift that I don't hit regularly, but the owner usually asks about $3 per CD (hopefully, if I refer to it as computer software, she'll knock a few cents off).
Keep in mind that I don't have a CD-i...yet. Are these systems expensive and/or easy to find and should I buy these games right away? They're not in exactly mint condition either (Zelda had a few light scratches on it).