Wioboy via Groupon offers the Bestek 1000-watt Power Inverter for $74.99 plus $2.95 for shipping. That's the lowest price we could find by $2. It features peak power of 2400-watts, two battery clamps, and a car cigarette plug.
Seems to be rated pretty good on Amazon.
But I cannot imagine why anyone would order from a podunk unknown storefront on Groupon when it can be had, shipped for 2 bucks more from either Newegg or Walmart - where it is easy to return free.
Kinda surprising that the normally responsive Amazon still has it at $90 rather than automatically dropping their price... aha, it is direct from Bestek on an Amazon storefront - explained.