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I can't add an item to cart; it says "not available any more".

This means your product settings have an Item Expiration date which has passed. To fix this in your E-junkie Dashboard, edit the affected product, make sure Show Advanced Settings is ticked at the top, and scroll down to the Inventory Control section, where you can either delete the expiry date there or update it to a future date when you want it to become unavailable again.