One of the better Amazon Prime Day deals is the ECOFLOW River 2 256Wh Power Station with the 45W Solar Panel @ $179.. However, you can use a $20.95 coupon (24EFPDHOBODR) to bring the price down to $158.

Walmart has just the Power Station (not the solar panels) for $139.

ECOFLOW also has an Ebay store selling Certified Refurbished products w/5 year warranty...
They have the 256Wh RIVER 2 for $148.. but a 20% coupon (SUNNYSAVINGS) brings the price down to $119.

Just be warned... on the 45W solar panels it will take ~8 hours to charge. I have the 110W panels which charge the 256Wh in ~4 hours.

This is a great little power bank.. I use one on my Reef Tank and just picked up an extra to put in the emergency kit.