Many Leclerc stores sold ZTE Open C phones in France. You can also use the ZTE online store: they're now at 50 euros, not 80 euros + discount. See http://www.ztefrance.com/smartphones/open-c/.

ZTE was selling their ZTE Open C which came with FirefoxOS 1.3 on ebay.co.uk, that's where I bought it from. I lived in the UK at the moment but I believe they were shipping it worldwide.

Checked the ebay listings again, there are a few sellers from Australia, the USA but seems like the ZTE listing is gone.

Don't buy the ZTE Open, it was a terrible phone

I had it. As far as I remember, it was a reasonable phone, especially for the price tag. The hardware was working ok and most of the issues were OS-related. The USB socket broke down after a bit more than half a year, however, I dropped the phone quite a few times, so couldn't blame the manufacturer.

The problem I had with it was when it was in my pocket for a couple hours, I would pull it out and it would be off. I'd have to pop the cover and pull the battery to get it to boot back up. If it wasn't for that, it wouldn't have been totally terrible.