Walmart offers the Rockpals 300-watt Portable Generator bundled with a 100-watt Foldable Solar Panel for $439.99. With free shipping, that's $60 off list and the lowest price we could find. (For further comparison, we saw just the generator for $189.99 in our mention from last December.) Buy Now Features 300W of continuous power 3 USB ports foldable solar panel water-resistant Model: RP300WPS+RP100WSP