We now have an online shop! It includes instructions and post-paid prices. Visit it here:
http://www.diophantine.net/shop

If you are a label or mailorder interested in carrying our releases, please contact us at info@diophantine.net.

Regarding trades, please note that we don't run a full-fledged mailorder, so we have to be rather selective about our trades. We try to get back to everyone who writes about trades, but if (for some reason) we don't, it probably means we aren't interested. Sorry!