Groupon discounts a selection of refurbished Vizio 4K Smart Ultra HD Televisions, with deals starting from $599.99, as listed below. Plus, all items qualify for free shipping. Deal ends May 2. The deals, with comparisons against buying new:

• Refurb Vizio 50" 4K 2160p 120Hz LED LCD Smart Ultra HD Television for $599.99 (low by $149)
• refrub Vizio 55" 4K 2160p 240Hz LED LCD Smart Ultra HD Television for $749.99 (low by $500)
• refrub Vizio 60" 4K 2160p 240Hz LED LCD Smart Ultra HD Television for $999.99 (low by $348)
• refrub Vizio 70" 4K 2160p 240Hz LED LCD Smart Ultra HD Television for $1,399.99 (low by $898)