Max Tool via eBay offers the DuroMax 3,500-watt Hybrid Dual Fuel Propane/Gas Portable RV Generator, model no. DS4400EHF, for $299.99 with free shipping. That's $150 under our mention from last summer and the lowest total price we could find now by $250. It features a 4-gallon fuel tank, 4,400W max capacity, 3,500W rated capacity, and up to 20 hours of run time.