What's the difference between an online store? Virtually nothing, it's nice to add the product to the cart and automated payment with a bank card, paypal, other electronic money of the client.
How not to fall for speculators?
I will say just do not see at very low prices.
It is clear that prices may fluctuate, but not in half. Real reviews about the store you need to look not only on the site itself, you know what I mean. If you pay with a bank card and specify a number, validity period and CVV code, you should remember that some services with this data can again repeat your payment. Without even demanding confirmation from you.
In this case, it is better to have a virtual card and put money into it from the real one. If the store does not have courier delivery, self-delivery and payment on the fact, it's worth thinking about it.
Successful shopping for you on the Internet!