I now have a contract with the seller.  If the seller does not honor the contract I have to explore my options. I will let you know when and if the seller contacts me.

You should explore your options, but if it were me I would hesitate spending too much money exploring. The common law will allow a contract to be rendered void under the "snapping up" doctrine (offer to good to be true "snapped up" and accepted.) Equity would likely refuse specific performance where the seller claims there was a mistake in the pricing. Of course, this is just general observation and may not apply to your purchase.