This is one of four Harry Potter Gallery sets. It isn't an actual playset but is instead a collection of minifigs. All of the minifigs were included in other sets but I think the Gallery sets were sold so that people could get the minifigs without needing to buy the sets that included them.
If you look below you will see that I have included links to Amazon and eBay so you can buy this Gallery set but I'll be honest with you - I doubt you will be able to find it. I've never seen it for sale on either source. You might have better luck on eBay than on Amazon but at the same time since you just never know when it might show up for sale.
Set HPG02 - Harry Potter Gallery 2
Year Released: 2002
Set Number: HPG02-1
Name of Set: Harry Potter Gallery 2
Book Set is Based On: Harry Potter and the Chamber of Secrets
Number of Parts: 0
Minifigures: 4 - Hagrid, Ron Weasley, Ron as Vincent Crabbe, and Uncle Vernon Dursley
Creatures: 0
Minimum Recommended Age to Build This Set: n/a
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.