Updated Post with new Info, January 6, 2019.
Earlier, I discussed how the only valuable book club edition (BCE) of the US Harry Potter series is the Junior Library Guild (JLG) Harry Potter and the Sorcerer’s Stone–this is still true and they’re quite valuable in almost any condition. And, while rarely seen on eBay and other book selling sites and shops, they’re around.
But, the Sorcerer's Stone JLG may not be the only JLG Harry Potter book club edition. The Junior Library Guild website also lists a Chamber of Secrets next to the Sorcerer's Stone, but I have yet to knowingly see one and the same can be said for my other Potter collector friends and dealer acquaintances who collect.