Since 2002 CF Martin & Co have offered a series of the Laurence Juber Signature guitars.
Wildwood Music in Colorado are currently offering an exclusive edition of OMC-44K Koa LJ models.
These are special custom shop instruments with all-hide glue construction and the highest available grade of woods.
There are 6 right handed and 1 left handed examples left, as of 12/18/12
All the previous models are now discontinued except the maple LJ Pro - examples occasionally show up on eBay.
View a short video about the Martin guitar factory