FreedomPop offers the refurbished FreedomPop MiFi 500 Wireless Hotspot with a 1-Month Premium Plus Services Trial for free with free shipping. (A 1-time $49.99 activation fee applies.) Even after the activation fee, that's $15 under our March mention and the best we've seen for this hotspot in any condition. (It's also $74 below the best price we could find for a new one today.) It features connectivity for up to 10 devices and up to a 10 hour battery life.
A 90-day warranty applies, although it's unclear who backs it. Also, be sure to cancel Premium Plus before your initial free month expires, or you'll be billed $9.99 for every additional month.