Woot.com has this iRozce 500W Portable Power Station Explorer for $279.99 with free Prime shipping.

• 1Type-C(5V~9V/2A~3A), 2USB(5V/2.1A) and 1*Quick Charge 3.0 USB(5V~9V/1.5A~3A)
• 110V/500W(Peak 750W)

amazon.com has this Westinghouse iGen160s Portable Power Station & Outdoor Generator for $109.99 shipped.

• 100 Rated Watts and 150 Peak Watts Through (2) 120V Household Outlets, (2) USB Ports, (1) Quick Charge USB Port, (1) USB-C Port, (3) 6mm 9-12V DC Outlets
• 55 Watt-Hours of Lithium-Ion Battery Capacity

amazon.com has the Portable Solar Power Station 520Wh Capacity for $500 - 45% off (clipped coupon) = $274.99. Shipping is free.