WPMUDEV has been testing and prototyping this plug in for some time now and they finally have it ready.
Yes, WPMUDEV is a membership site, but I believe they have a new thing where you can purchase individual products.
* Simple product thumbnails/images with lightbox zooming
* Add temporary sale prices
* Link a product to an external link (for affiliate commissions, etc). You can also turn off all checkout features and use MarketPress as a listing plugin only, generating revenue from affiliate commissions on sites like ClickBank, E-junkie or Amazon Affiliate.
* Assign categories and tags to products to make them easy to find
* Stock tracking with alerts
* Order Management/Alerts
* Fully customizable email messages
* Full support for most major currencies
* Flexible sales tax/VAT options
* Full coupon/discount support. Create coupon codes for percentage or amount off, and control and track their usage date range and/or maximum uses.
* 3 built-in css themes designed to work within your site theme. And it's a simple matter to add your own.
* Fully customizable store urls/slugs
* Customers can checkout without being a site user
* Order status tracking for customers on the front end. Previous orders are stored in a cookie or user meta.
* More quality features than any other WordPress ecommerce plugin.
* 4 payment gateways - PayPal Express Checkout, PayPal Chained Payments, Authorize.net and 2CO... more coming soon!
WordPress eCommerce - MarketPress - The complete WordPresss ecommerce plugin - works perfectly with BuddyPress and Multisite too to create a social marketplace, where you can take a percentage! - WPMU DEV