Conned Straight…On eBay

A real-life fact pattern for a Contracts final exam: “How I got an uncooperative eBay buyer to pay for her purchase”.

Via Consumerist who asks: “Unethical? Yes. Illegal? Probably not. An eBay bid is a binding contract. An email is not.”

I believe in California a binding contract can result via e-mail, but you’d still need all the elements of contract formation to be present.  Were they present here?  Are there any defenses?