I took a taxi from Delhi to Agra at Rs5.50 per km as I knew him but the other travel agent might charge you from 8 to 10 rs per KM.

I will give you a better option go to southren travels in Delhi. They will arrange everything for you http://www.southerntravelsindia.com/

They have all kind of packages like sending you in a bus or a taxi approach them. These are some of the safest ways.... Please let me know if you would like ot know something else.