eBay with Ecoflow has the refurbished EF Ecoflow River 2 Portable 256Wh Power Station (ZMR600-US) for $149 - 20% off with coupon code ECOFLOWJUNE20 [Exp 6/28] = $119 with free shipping.

• 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