Both modern and vintage stereo viewers tend to be carried by photo dealers.
I would suggest two possibilities other than searching around in local
shops.
1. The NSA national convention will have lots of viewers. Will be held
July 4-6 in Bellevue, Wash., Red Lion Hotel. Info. re convention
from Phyllis Maslin. e-mail [log in to unmask]
2. The magazine of the National Stereoscopic Association is,
"Stereo World" Carries ads, etc. on the web you can locate info.
at http://www.3d-web.com/nsa/sw.htm
If you join the organization you can place three free ads in the magazine.
Need info? let me know.
My e-mail is: [log in to unmask]
Good luck, Paula Fleming