Our Lady’s Rosary Makers has supplies and instructions for making cord Rosaries. I used to make them by the hundreds until I started getting migraines.
You can get a 1000' spool of paracord for less than $50 at this site. Here are instructions for making a Rosary solely out of paracord.
It’s great to have Rosary beads, but I have five fingers on two hands, so in a TEOTWAWKI situation I’m not sure it’s urgent to have the beads. I do however want my crucifix and miraculous medal.