Boost Mobile offers the used No-Contract Apple iPhone 6 16GB Smartphone for Boost Mobile in Space Gray, Gold, or Silver for $199.99. Coupon code "BSV501Q17" cuts it to $99.99. That's $200 under the lowest total price we could find for a refurbished unit and the best deal we've seen for an iPhone 6 in any condition.
Looking for an unlocked unit? BidAllies via eBay offers a refurbished one for $199.99 with free shipping, the lowest price we've seen for an unlocked iPhone 6.