Hi Quine,
Yes, sourcing authentic designer products is quite a challenge not to mention pretty costly!
You might want to check out these previous posts regarding SammyDress.com:
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As for this supplier, Link hidden: Login to view, whois.com shows that their website has been registered on October 1999. However their website doesn't support it. In fact they their "About Us" page is very vague. That doesn't mean they're not a legitimate supplier, we simply cannot vouch for their reliability as they are not part of the SaleHoo Directory. I also had a chance to chat with one of their representatives to confirm their payment methods. They accept PayPal, credit cards and bank transfer- depending on the total purchase amount. So if you wish to work with this company, make sure to only use safe payment methods such as PayPal and credit cards.
Here are some suppliers that you might want to work with:
Banggood
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Dropship DEALS
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Online Trade Services
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ClupFashion
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Stylewise Direct
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Let me know if you need further assistance.