Classic Medium Format Slide Mounts:
One case of Wess "DGX-002" glassless 645 mounts.
There are 10 boxes in a case, each box contains 20 mounts,
for a total of 200 mounts per case.

B&H used to sell these for $110 but they have been unavailable for over a year now.

$55 shipped to you (1/2 price) (check or Paypal).

These mounts would be perfect for those wanting to do 645 MF stereo
projection with 2 separate polarized projectors.
thanks,
Philip Steinman

http://www.bhphotovideo.com/bnh/controller/home?O=productlist&A=details&Q=&sku=62598&is=REG

Wess General Purpose slide mounts are designed for those not requiring registration or exact placement of the image within the mount aperture. GP mounts hold the film squarely in position with small clips and rails, no adhesives are required. These Wess mounts are the easiest and quickest to use, particularly if film must be frequently removed for reproduction purposes. Wess GP mounts are recommended for most typical applications.

Glassless mounts do not offer the same image protection as glass mounts. However, since there are fewer surfaces to clean, dust is only a minor problem. Another advantage is that glassless mounts allows air to circulate freely around the film so moisture is easily released during projection. Glassless mounts are usually preferred when making duplicates or prints as the textured surface of Anti-Newton glass can cause a "grainy" appearance. Being lighter and less fragile, glassless mounts are often used for transporting or filing stock images. Without the restriction of glass, it is possible to manufacture a thin mount. However, thin mounts are rarely used for professional presentations as their light weight may cause an incomplete slide change.