Hi Rich.
That's a nice site!
The first thing I notice is you aren't collecting their email addresses. I'd put a sign-up form on the front page
immediately and offer some kind of incentive to sign up. With the traffic figures you mentioned you should be growing a huge email list of subscribers who you can direct back to your site again and again for years to come. Send out "members only" special offers and coupons regularly and build a relationship with your subscribers so they know you and trust you.
I recommend an email service such as
www.aweber.com or
www.emailaces.com Both are less than $20 per mth.
Also add an "Add to favorites" link and a "Tell a friend" link. You could even add a short audio introduction.
All of these things are very simple to do and will increase the number of returning visitors and therefore your sales conversion rate.
Regards,
Andrew