I think there's something wrong with the store. There were 170+ copies a few hours ago if I logged in with one browser, but "sold out" if I logged in using another browser. And the coupon code didn't work.
looks like it is out of stock on US. It will be available soon (I will send an email). If y'all have any problem with the coupom plz email matt@soulmuppet.co.uk. thanks so much for the interest and support.