1. I assume the price listed now is lower than the price he first quoted ... he just changed all posts to reflect the new lower price.
2. You have never heard of Sea-Tac (a.k.a. Seattle-Tacoma International Airport)? This is a famous phrase that is commonly used for this major airport.
3. You're not supposed to comment on prices anyway. If you don't like the price of a domain, move on.
4. P.S. When somebody has belonged to a forum for 10 years, and you've belonged for 1 month, don't jump to conclusions about their posts.