That's probably your best bet, or a used one from Gamefly. I doubt you'll find one in Toys R Us. I was going to get it for $40 from TRU then found out the $10 price was coming up in a week so I got greedy and waited and sure enough I couldn't get one. Seems like a rare game because I couldn't find another one in a few other stores I checked.
I ended up buying it from ebay for $21 shipped (buy it now) but that was right after the TRU sale and they were flooded with cheap copies. You can either wait for a fluke sale and hope to get it cheaper or suck it up and pay $30 or get it from ebay or gamefly a bit cheaper. If you want it sealed you might have to pay close to $30.
I did enjoy the game, I think it's worth $30.