I just entered an "I Own It" check-mark and a rating against Amazon's catalogue entry for The Great Book of Amber, and all of a sudden I'm getting recommendations for a series of books by John G. Betancourt, called Roger Zelazny's The Dawn Of Amber, a trilogy set prior to the original novels, establishing the rise of Oberon. Reviews appear to be mixed, but generally positive.

Doubt I'll bother, though.