I think the site is buckling under the HN stress lol, especially the checkout cart. I doubt that this would be an issue under normal circumstances, but I just wanted to let you know that the site is getting tons of attention. Congrats! =D
Or maybe it is supposed to be but there are some fallbacks being used under the current heavy load.
I tried manually going to https://www.copyhackers.com/ , but that tries to serve an SSL certificate for webcopygirl.com (which looks like a parked domain).
Configuration problems, or lack of SSL certificate? If the latter, do you already know about StartCom (https://www.startssl.com/)? They provide domain-validated certificates for free.
Sorry to anyone who's experiencing trouble. The discount lasts a few days, so please do return - or email me, if you need any help: joanna AT copyhackers DOT com.