GarageSale 6.4 is out. You can download it right away from this page.

Here’s an overview of changed or added functionality:

• GarageSale 6.4 adds a product code field, where you can enter the UPC, EAN, or ISBN code of your item – if it’s not contained in eBay’s product catalog.
  Search engines will recognize this product code on your listing’s page. Thus, when somebody searches for a particular product, your listing will appear at a higher position on the result page.
• We have been offering free image hosting to GarageSale users for a few years now, but so far we’ve always excluded images using in ‘Good Till Canceled’ (GTC) listings from that service. This was because we deleted images on our server after 60 days to make room for new pictures – a strategy that didn’t work, if your GTC listing is available a lot longer than that.
  With the upcoming shutdown date for .Mac/mobileMe web hosting on June 30, 2012, which has been very popular among our users for hosting images used in GTC listings, we realized we need an easy-to-use replacement.
  Therefore GarageSale 6.4 adds a paid service for storing images for your GTC listings, starting at USD3.99/month.
  You can sign up for that service directly from within GarageSale’s preferences panel.
• We improved the popular automatic re-listing feature, which starts new listings once you item has sold out on eBay. Now this feature is linked with GarageSale’s inventory management. If you have less inventory in stock than what you are offering for sale in your auction template, GarageSale will not start the auction.
• GarageSale now offers an overseas surcharge field for sellers on eBay.com, where they can specify an additional shipping charge if the item ships to Hawaii, Puerto Ricco, or other US-oversea areas.

The complete release notes are available on the GarageSale download page.