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The Geeksphone devices are sold out, but you can get a ZTE Open with FirefoxOS on eBay for only $80/£60. Details at https://marketplace.firefox.com/developers/dev_phone

:)

How is the ZTE Open for dev purposes? I'm not familiar with how Firefox OS handles OS updates, but will I (essentially) always be able to update it?

It has fastboot just like unlocked Android devices. More details here: https://developer.mozilla.org/en-US/docs/Mozilla/Firefox_OS/...