Hoopshype has a link reporting $2.3 million over two years. Andersen is a pretty limited player, but at this summer's prices, that's a bargain. I'm a little surprised he didn't fetch more.
His career rebounding numbers - 4.2 rpg over 14.5 minutes is the equivalent of 7.2 rpg at 25 minutes. Obviously there are reasons he didn't play more, but he certainly looks cheap at the price.