I tried running a search for potential drop ship suppliers but I was not very successful in finding one. I did send you an email of a few suppliers that you may want to check out.
With regards to the guy (from China) you are in contact with, try exchanging a few more emails or phone calls before deciding to order. Sometimes for things like these its best to go with your gut feel. If somehow you're just feeling too uneasy then maybe you should not proceed.
Warranty return policies may differ from one supplier to the next and some would also depend on the type of product being sold.
Hope this helps.