I am obviously not affiliated with them as I've posted about my bad bag experiences here many times - but here's my story for it's two cents...
I stumbled upon Italist through ShopStyle, which is pretty reputable with it's referrals. I wanted a Balenciaga mini bag for travel and Italist had by far the best prices, around $200 less than US retail. I also found one out of season on sale in a color I loved, so it was actually $400 less than retail here. I simply couldn't pass it up, you can't even find a good used one for that price!
I read ALL of the details, and that is key, you need to read the details. I was going to order some CL's too, but thought.... what if they don't fit. (Plus, if your order is under $800 you don't have to pay duty taxes.) Like another person said, you don't want to mess with returns so consider it final sale.
So I go to order and my bank is not having it. Fraud protection calls right away, so I'm a little weary. I lift the hold, and I STILL can't process. I get an email from Italist saying this is common for out of country residents, and to talk with my bank. I call my bank again and they are saying something about charges processed in the Netherlands are hard to lift. I get a sinking feeling BUT who could stand between a lady and her bag!
Finally, its lifted and I purchase. I get my confirmation right away and an email when it's sent from the supplier. They do source from local stores, so you're getting this from small retailers around the country. My gorgeous, authentic, darling bag arrived in no time. I even took it to the local store to have it checked!
So, I'm not sure why they can offer these prices, typically prices over there are lower, and when you don't have to pay VAT, its even better. I've bought things on vacation over there that were such a deal, so I didn't feel too weird about it. I'd just make sure you call your bank BEFORE trying to buy, and go for something you don't want to return.
Hope that helps!
These bank fraud protection depts are flagging *all* offshore purchases these days I think.
I tried to buy from Department Feminin a while back and same thing, the bank wouldn't let it go through without talking to me but I made the purchase at 1am.
I finally cancelled the sale with that card and used paypal (which seems to let you buy anything anywhere).