Before spending a lot of time with this - have you thought out your customer acquisition strategy? At such low price points Adwords will be very expensive. How are the others in space doing promotions?
BoxBe is a startup you should look at...they started with this idea, but according to a few friends of mine that use it no one has ever bothered to pay them for their attention. As a revenue generating business model, it seems thats spammers don't pay!
btw - Goodmail has signed up ISP customers to get mailers to pay a couple of cents per message to "guarantee" the delivery of the message. To me seems like a protection racket of corp. customers by the ISP and Goodmail.
Better take care of this asap. I've got medial epicondylitis, better known as golfer's elbow from typing to much. I've tried everything to get rid of it including 4 months of PT, but it always comes back. It sucks. I'll try anything at this point.
I collect old computers and now own: Kim-1 ('75), Apple II ('77), Commoodore PET 8K ('77), TRS-80 Model I (78), Apple Lisa-1 (83), Osborne-1, Atari 400/800, Heathkit H89, Northstar Advantage, Next Computer Nextstation. I even own a reproduction Apple-1 and manuals to the Xerox Alto.
I know http://www.silverorange.com. They seem very good. They made Firefox's layout (I believe) and even Digg's layout. But I assume it must be kind of expensive.