Never mind. I got it to work.  For some reason, it didn't apply until I went back to the front page, then clicked on my cart again.

Holy cow, what a sale.  60% off. I got Miki 3 for $16.  (It's almost 300 Mb.  Pity any purchaser on dial-up.)  I also got a ridiculous number of Dinoraul's dinos, and am kinda wishing I bought more.