If you ask me it's not a price mistake
They matched the price to samsclub.com
Regardless, this is an extremely good price. The cheapest you can find pallet trucks for regularly are $350, and that's if you're buying the cheapest quality (this brand is not even the cheapest quality).
Thanks OP, my boss is considering purchasing it
EDIT: Sam's club is charging a large sum for shipping (I typed in a couple zip codes and it says $149 for shipping). Amazon includes free shipping.
It may be a possibility that Amazon automatically matched the price without considering shipping costs.