On Ebay.  I'd be tempted but for the rather disgraceful condition of it.  How can this be justified?  I remember, about a dozen or so years ago, seeing a wrecked Filson jacket.  The seller seemed almost proud - certainly unabashed - to be offering it.  Who would have bitten?  Perhaps someone in Japan? 
Anyone own anything of theirs (Duxbak, not Filson)?