Hello Louis, and welcome to Just Answer!
I've found the following information for you regarding Mas Konatsu:http://www.worthpoint.com/worthopedia/mas-konatsu-japanese-artist-painting-83223491
You can contact Worthpoint to find out any further information about the artist. I've checked, and there are no current eBay auctions for his paintings.
As you can see as stated at the site above and from your own experience, his work is extremely difficult to find. This is because it is primarily in private collections. I think you'll find the following article interesting and informative. Although the article is not very recent, it might be a good idea to contact any/all of the groups where he is listed as a member, to find further information about a listing of his works and/or Galleries that may have them: Group 21, Los Gatos, San Francisco Art Guild and Allied Artists Guild. http://digitalcollections.mypubliclibrary.com/digital/11/3634/1/33.pdf
The article is a little difficult to read in that format, so I have printed it for you below:
"Mas Konatsu's acrylic paintings are distinctly his, soft colors blended together to form an uncomplicated, pleasing design. As a native of Orosi, Calif, his farm life background and closeness to nature are reflected in his unusual landscapes. Konatsu received his first art training from his father, then developed his talent and won his first award at the age of twelve. His formal art education was received at the College of Sequoias,Visalia and San Jose City College, San Jose, Calif. Mas maintains a studio in San Jose where he is a resident. He is a member of Group 21, Los Gatos, San Francisco Art Guild and Allied Artists Guild. He has exhibited throughout the United States and received numerous awards in competitive, outdoor, invitational and juried shows. His work is in private collections in the United States and Europe."
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