Logo Design

I am in the process of having 3 websites designed shortly, and need 3 different logos. So far there is a polling site, ecommerce site and a database site. All websites will be trade names operating under one company. So what I want is a logo design to reflect both the trading and operating name for each website. As a demo example, my initials are CK, this would be the company name, and then each trade name would follow i.e. CK Polling, CK Commerce, CK Data. I have not thought of the names for the company or websites at the moment, so I would like quotes or estimates on what a logo project like this would cost.