This is one of three sets sold in 2002 that aren't new sets but is a collection of previously sold Harry Potter LEGO® sets. I am guessing that Lego did this so that people who wanted multiple sets could get them in one purchase, but I don't think they were all that popular because they only did this for a few years.
I have never seen this kit listed on either Amazon or eBay but I’ve included links to both sources just in case you get lucky. However, it will be much easier for you to buy the sets that were included in this kit separately, which is why I’ve included links to each set in the description.
Set K4706 - Sorcerer's Stone Kit
Year Released: 2002
Set Number: K4706-1
Name of Set: Sorcerer's Stone Kit
Book Set is Based On: Harry Potter and the Sorcerer's Stone
Sets in Kit:
4701 - Sorting Hat
4702 - The Final Challenge
4704 - The Chamber of Winged Keys
4705 - Snape's Class
4706 - Forbidden Corridor
4709 - Hogwarts Castle
4711 - Flying Lessons
This LEGO® set contains small pieces that could be a choke hazard and is not meant for children age three and younger. LEGO® is a trademark of the LEGO Group of companies which does not sponsor, authorize or endorse this site.