Ordering parts through the online store.

Good evening, all. The question is, who ordered parts through the online store? He lived almost in the village (also the city of the closed type) or one large store, no accessories, and those that are just unreal cheat working. Recommend any online stores where you can collect the system unit. So far I found only Hardware (in the nearby town of point of delivery). Through the Mail of Russia somehow afraid to order.
PS are There any pitfalls in this kind of orders?
Thank you all in advance for the advice.