Rugged Rosaries sells many different styles of paracord rosaries, most for around $40. Making your own could cost more or less, depending on the the crucifix, medals, etc..
I made a rosary for the brother of the confirmand, who will be making his First Communmion this coming Saturday. His favorite color is blue, and his favorite saint is St. George. I used thinner paracord, so I was able to use a metal centerpiece.
