One rule of thumb for most internet businesses is that if you can't identify an actual physical address anywhere on the website, you should be very wary of doing any business with them.
There is no physical address or even phone number that I saw on their website. When the only way to contact someone is via a gmail email address, I would not do business with them, but if you do, I would only use a credit card and if the product is not received before payment is due, then the you can refuse payment by contacting the fraud office of the credit card company.