Reply To A Lowball Offer

Whenever I receive an email, I usually respond very quickly. But sometimes, especially when I want to smack the sender and give them a good kick in the ass, I will wait for the next day, so I have time to cool down. Yesterday was one of these days. Here is an extract of the email:

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I'm interested in buying a DVD copy of your construction library, 162 photos. I purchased a similar DVD from a photographer in Calgary last December for $20.00. Would you be able to sell me your library for that amount?"
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I should have answered: "That would be $0.12 per photo! Get Lost!", instead I responded:

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For Internet, low res photos with a 6 month license will be $19 per photo or $3078 for a DVD of the 162 photos.
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To which he didn't reply, so far. I'm not waiting for a response. I also have a couple of alternative answers:

  1. You left out three zeros.
  2. I can't afford to go out of business