I rely heavily on CheapShark to compare the best deals. I wish it was updated in real time (I think they have a small team running the site), but they are pretty good about letting you know where the best deal is and if there is a promo code you can use to get it even cheaper. Their Twitter feed is pretty active, too.

Puppy Pong, eh? Sounds about as fun as Chase the Chuckwagon. Neat exhibit though. Very cool rare pieces of gaming history.