I haven't been dealt with them personally, so I did a background check and found a couple of extremely different views about them. Link hidden: Login to view Link hidden: Login to view
If this is the first time you noticed it, there a number of suppliers that sell on eBay along with with their resellers. Although a number of these suppliers are ethical enough to not compete with their resellers. Maybe they have a policy about this as well. You can try ask them about it.