ecommerce plugin suggestions?

[emusicmotion]

Hello, I want to sell my music tracks on my church theme with an ecommerce feature combined with a secure downloads.

Someone suggested I go with ultracart.com but they charge you a hefty cut of your sales to use their product. I was wondering if there is a free way to set up a shopping cart/secure download feature for digital downloads where you can keep all the money you make on a transaction?

I saw a page for WP secure downloads which claimed to be a pay-once option to purchase the plugin http://tomuse.com/wordpress/wp-secure-downloads/ however, when you click to be taken to the plugin page, it doesn't appear to be available for purchase anymore.

Anyone have any solutions to offer?