Data collection / research

I need to have contact data of my potential clients collected from various websites.

I provide professional consulting services to small Polish building contractors and as part of my marketing strategy I send out regular newsletters to companies on my mailing list.

Currently, I have approx. 250 contact in the distribution list and would like to expand this further. Most current contact I have copied from various websites, however as I got busier I just have no time to do it myself.

I could point the freelancer to various sites where Polish builders advertise, anyway these not difficult to find. I\'d provide the list of current contacts to avoid duplication. I\'d require data to be provided in an excel file.