eBay with Ecovlow has the certified refurbished EF Ecoflow River 2 Portable 256Wh Power Station for $135 - 15% off with coupon code TOPSELLER15 [Exp 3/25] = $115 with free shipping. Roughly 45 cents per Wh. Includes 2-year Allstate warranty.

• Output of up to 600W, weight: 7.7 lbs.
• Ports: 2 x A/C, 1 x D/C, 2 x USB-A, 1 x USB-C