josh gosfield's dashboard

I get this error message when I try to order copies ro go to my cart.
We're sorry, but you've encountered an unexpected error. We have logged this problem and will look into it. Please use your browser's back button to continue where you were, or see our Contact page for support options.

Perhaps I am missing the obvious but after publishing my magazine i can't seem to find any link to order a proof - though I can go straight to purchasing copies - so exactly where on the site can I order a proof?

I want to print an art project of mine in which many of the images have been halftoned or screened to appear like old magazines.
does your printing process screen images like standard offset (in which case I might get moire) patterns - or is it more like ink jet printing (which works fine)
This is a small section of one of the images.

thanks
josh