I've more information. Email from Tina Goodwin (<tina@williammatthewsgallery.com>).
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Dear Patrick:
There isn’t a print available of the painting of The Trapper, that you saw at the Convention Center. However, there were several studies in preparation for the commissioned painting. I am attaching jpeg files of the watercolors and pasting them as well into the body of this email with the details for each painting.
A Limited Edition reproduction of another painting entitled, The Trapper, is available. Here is the link to the page on our website where it appears,
http://store.estreet.com/willmatt/Detail.bok?no=818and below is the image that I have pasted into the email.
The TrapperEdition of Fifty
$580
Evening Light19 1/4 x 28 image
32 x 38 approximate framed size
Watercolor on Paper
$10500.00
Evening Tunes28 x 16 image
40 x 26 approximate framed size
Watercolor on Paper
$9600
If I can answer any additional questions please feel free to contact me at the gallery.
Were you aware of the artwork of William Matthews before seeing the paintings at the Colorado Convention Center?
Many thanks for your interest!
Kind regards,
Tina
Tina Scatuorchio Goodwin
Director
William Matthews Gallery
1617 Wazee Street
Denver CO 80202
T: 303.534.1300
F: 303.534.2853
tina@williammatthewsgallery.com
www.williammatthewsgallery.com
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Anyway, I haven't that kind of money for paintings. If I did, I'd be buying concertinas.

Still... interesting to see a concertina just randomly like that.
Patrick