I've been getting the same emails.
Instead of an unsubscribe link, there's this paragraph at the bottom of the email:
You are subscribed as XXX registered on eBay. To change your communication preferences, log into My eBay and select the Account tab, then click on 'Communication Preferences'. Please note that it may take up to 5 business days to process your request.
I didn't want to do this.
Instead, I found (by trial and error) that if you take the link at the top of the email that says:
Can't see the pictures? Select "Always display images" or <view this message in your browser>.
Copy the link URL for viewing the email in your browser. It should look like this:
Change it to:
It shows an "Unsubscribe Successful" message.