Product review (1 stars): SELLER IS GOUGING YOU !!!!!
5231JA2006B (or LG LT600P)is the newer and BETTER replacement filter for 5231JA2006A, and is only about $45. This seller is trying to make a killing selling the "original/old filter" to people who don't know any better.  This older filter is only about $35 at most sites that still have it for sale.