Here are the search results for the 40th anniversary edition on Amazon. Depending on whether you want the DVD-A version included any, of the first three listed are the actual 40th anniversary remastered release.
http://www.amazon.com/s/ref=nb_sb_ss_i_2_13?url=search-alias%3Daps&field-keywords=in+the+court+of+the+crimson+king+40th+anniversary&sprefix=in+the+court+%2Caps%2C194
http://www.amazon.com/s/ref=nb_sb_ss_i_2_13?url=search-alias%3Daps&field-keywords=in+the+court+of+the+crimson+king+40th+anniversary&sprefix=in+the+court+%2Caps%2C194