Tyvek Washburn Map?

[TEO]

I could swear that I saw someone with a Tyvek version of the Washburn map. Does anyone know where these can be purchased? Pinkham only?

 

[swamp]

As far as I know the Tyvek version of the Washburn map has been out of print for several years. If you find that they are again available let me know because I want one too.