The site is temporarily down. Eric posted the following on Flick on March, 6th 2013:

"The Pinhole Resource website has been down since mid-Febuary because our server abruptly quit. We are trying to get it back up. Call us at 575.536.9942 to order pinhole products or for information.
Nancy Spencer
Eric Renner
www..pinholeresource.com
"

I'm not sure, but their email could be: pinhole@gilanet.com