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It probably legit. Autozone was selling ZD-11's for 2.99/piece a while back so he probably bought those from AZ and is now doubling his money on Craigslist.
The shipping is USPS Priority Mail and is $8.95 for one set or all three. If you want a set you can purchase them thru PayPal or USPS Money Order. If using a money order, please let (him) know so (he) can hold a set for you. PayPal account is: