Need Web Developers

I need full website for my newly being developed departmental store, Initially It is only for one location later on other store will be opened in another city with the same name has more functionality than this one.

Initially store will be started with about 3000 plus products gradually we will be adding products according customers interest and behaviors.
We are planning to offer online product delivery system also with the same website.

I want to integrate my hardware shop website also, Both website should work separably but they must integrate each-other i.e. a small vertical icon on the right or left side of the websites same as advertisement. so that customer can go easily for their desired product whether they require daily need product or rarely used hardware.

Please tell me total cost and required time duration.