Tekreplay via eBay offers the refurbished 4th-generation Apple iPad 16GB WiFi Tablet with Retina Display in Black, model no. MD510LL/A, for $208.99 with free shipping. (A4C charges a buck more in Black or White.) That's $10 under our March refurb mention and the lowest total price we could find for a refurbished unit by $12.
A 30-day Tekreplay warranty applies.
Update: A4C now offers it in Black for $199.95 with free shipping.