Sorry, just now checked back.
If they appear to be selling them in mass quantities, that's not a good sign. Ebay will tell you how many of the item they have sold, and how many they have left. There are tons of people who buy Disney things and resell them, but not generally in horribly mass quantities. Anything above a total of 7, you should be wary of. There is a chance they are cheap duplicates.
I would also recommend not buying any that offer free shipping from China.
If the seller does not allow refunds, there is a high chance something is wrong with the item. They may or may not disclose it, but as a general rule, it's just wise to keep away from anyone unwilling to take an item back. You never know how you may feel when you get it. I've returned several Belle's because their faces just weren't doing it for me.
If you have any allergies, reputable sellers should warn you of allergens from their home. If you have any concerns, directly message them.
And, maybe it goes without saying, but always check the sellers reviews. And by, checking them, I mean making sure there are more positive than negative, and looking into the negative to find out exactly what the problem was.