Well there is Photo CD software that can author disks (Works like any DVD professional grade authoring tool), but as you can expect it went for a few 100 dollars (to companys) and isn't sold anymore after Kodak started doing its own Photo CD developing. After that time, Kodak only distributed the applications to licenced kodak developers.
As to your previous statment, yes you can't get them anymore or even think about purchasing a set. Yes, it is true you can purchase a HK Silver CD with loads of applications (Including Kodak's Photo CD program kit) but thats not allowed here. But I do know thats avaliable since C.Chen had such a Chinese disk.