Hi Smash,
You can NOT have a direct link to an off Ebay site in your listing BUT you CAN have a direct link in your About Me page on eBay. That is the only place eBay will allow it. If they find a direct link in your listing they will either make you change it or they will pull it without notification.
Good Luck with your new store.
Doug
"Let's be careful out there people"
My Store