Shipping from Canada to U.S. eh?

So I am looking at buying an engine on ebay from Canada and having it sent to California. It is about $2000. and am wondering if anyone had an idea what if any customs fees might be for a transaction like this.

"International items may be subject to customs processing and additional charges"

Would rather not go this route but I am getting really jerked around by a seller out in Pennsylvania that has been shipping me an engine for about three weeks now. All communication from that seller stopped not longer after the transaction was completed. It has been almost a month now and they cannot be bothered to return an email or a phone call. I opened up a case with Paypal about it so they have frozen the transaction but I am really pissed as I have put my engine search on hold for a month. As soon as I get some kind of resolution I will be more than happy to share who the seller is.

Thanks guys!
Mike