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That's a good price and ARP's are excellent quality.
Make sure when you have them installed that they check the heads and block to ensure they're perfectly flat. The updated '06 head gaskets are a nice improvement and having studs is a great confidence builder for the 6.0 Owner!
There is a seller on eBay who has an auction where you can make an offer, and I know he was taking offers of $370 plus $15 shipping in the past. Maybe you can save a few more bucks!