Yes they are, but I had to do some hunting. So far I could only find them on ebay. Then yesterday I found 13, in an antique mall. Plus I bought about 5 off of ebay, plus the one my father gave me years ago. So I have at least 28. The disks themselves are hard to find. Of course when I found the 13 yesterday, I had to buy them all. Finding, one was cool, but finding 12 others while at the same mall, was really exciteing.