You took the right decision of using Drupal for your web needs, bravo! Now you need to assign the work to the right web developer and you need to find out how much it is going to cost you.
I am against the policy of "fixed prices" because every webpage and every client has very different needs. Contacting me for a quote is the best way for finding out how much your website is going to cost you.
However, a generic pricelist is available for you.
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