Hi the EARLIEST JW appearance available on commercial DVD is
"Careful please" released February 1926 a ham hamilton short part of a DVD set called "the lost magic of Ham Hamilton" AND JW FIRST public appearance that we know of.
See Roughrider website for what else is available commercially
http://dukefilmography.com/john_wayne_dvd_filmography.html
re Noah's ark this is available from Warners it has been released as one of the warner archives titles. I have this and its not a bad print.
