Actually, I got a reply the next day:
"All MSRP prices are provided to us by the manufacturer and unfortunately we are not authorized to make any changes that they have not formally requested. We apologize for the inconvenience."
So unless we can get Sony to send them a correction, we're out...
We're also going to have to be careful about what dd uses for "List Price". For example, they list "Three Stooges Collection 7" as having a list price of $29.95. All other stores list it as $24.96. I just emailed them about this.
In the past, I've seen complaints about dd's prices rising...