Would anyone know or have a resource to point me to that would tell me what newspaper comics from around 1929-1930 are currently available in collections? I know Buck Rogers, Lil' Orphan Annie, Popeye/Thimble Theater and Blondie are in print, and I know they published volumes of Sunday volumes. Any others?

I cannot add to the ones you list, but this forum is one I often frequent, and it's chock full of older members with a particular interest in archival editions of very old comics, and they post about newspaper strip editions all the time. Many of their members would know.

http://marvelmasterworksfansite.yuku.co ... MaGIYNT99U

Terry and the Pirates is out, but it started a little later I think.

The Library of American Comics might have a few more to interest you:
http://www.libraryofamericancomics.com/catalog/