eBay with EcoFlow has the certified refurbished, nearly new EcoFlow Delta Pro 3600Wh Portable Power Station for $2235 - 15% off with coupon code EFMEMORIALDAY15 [Exp 6/15] = $1900 with free shipping. Roughly 53 cents per Wh.

Comes with all accessories, has a huge capacity and fast charge. Check out this review.