Your list price is definitely incorrect; you’re using a list price of a third party seller on Amazon, and regular retail price on this set was 24.99 when it was originally sold.
It’s been possible to pick this set up for well under $20 at times in the past (technically still is, though from private parties, not from retailers since it was discontinued in December), so your info is incorrect. This is less than $1 off MSRP.
Woot defines “list price” as:
“…the suggested retail price of a product as provided by a manufacturer, supplier or seller.”
So, if there is ANY seller out there (even a third-party one) that is selling it for that price, then it meets woot’s definition of List Price.