As mentioned here a few times, these are very inexpensive disks buyers can add on to their purchases. To get over $25 for free shipping, for nonPrime members. However it does not appear one is able to search for them directly. They just seem to pop up. It would be convenient if those of us who come across one could post it here. With the instructions on how to browse among them, we could more easily order a few with our next order.
I fairly recently had a 3-disc Sony box called simply "Chopin" for about £1.50, which included a lot of old but serviceable recordings - Andre Watts, Philippe Entremont etc., which did fine for someone who doesn't put 19th-century piano music at the top of his list of enthusiasms. Sadly, I now can't see it either on Amazon US or UK (so that's not much help, is it?). But good thread idea. I'm sure we all welcome ideas to "play the system" so that we get more CDs for less.