I just placed my order through Amazon for an A20 from Electronics Expo.
$309 + $19 shipping - $30 for Amazon Visa = $298... shipped.
Not bad. I already have "The Departed" on HD-DVD sitting here from Netflix, an accidental acquisition. I just wish EE were closer than New Jersey. It's unlikely I'll actually get the thing next week via UPS Ground all the way across the country.
I figure I'm saving myself ~$30 + tax over what the Costco price will most likely be, and I don't have a Costco membership so I have to inconvenience somebody.
The Amazon card is through Chase, and I have a Chase Mastercard with a crappy rate with no balance. So I cancelled it, signed up for the Chase Visa through Amazon for a slightly less crappy rate, and scored $30 off the price of the HD-A20.
So I got an HD-A20 for about $20 more than a D2 would be if I ran up to Costco. Seems worth it to me