That is quite tricky...since you're closing down your wine business and you still have opt-ins, one thing that comes to mind is signing up with a wine affiliate program such as wine.com where you link your site with theirs and you don't have to handle any physical products or even refunds and you'll still make good use of your wine knowledge. As a business man, I would advise you not to sell your 900 emails, if you don't have anything to sell them at this time, just keep feeding them with good information that is worthwhile until you set up a proper affiliate site. Selling those emails will probably get you $0.10 - $0.5 per email. Its not worth it if you ask me especially considering how much time it took to gather them and resources of maintaining them...