network cabling

I've always bought my ethernet, HDMI and audio cables from monoprice in the past. Upon researching the new standards (cat6, cat6a, etc) it seems like there is a whole slew of "new" online retailers that focus exclusively on cables. Their prices seem to be more than monoprice which has me...

I 'splain and show my need here: Running a cable up into an attic from first floor server room. I want to run the cable along the i-beam and mount the Open-Mesh WAP to a cinder wall. Looking for recommendations to websites/vendors that cater to network cabling equipment, mountings, etcetera...