Signage for Retail Store

I recently opened a small computer sales and repair services company.  I am a registered Dell partner and also am registered with Logitech and others. I am trying to figure out how to go about obtaining signage for the retail space.  I have been to other stores in the area and they have posters, signs, etc from manufacturers.  Any one have any suggestions on how to obtain any of this ?  Thanks for your time.