Repair Kit

Repair Kit is a treasure.

Source
Repair Kits can be purchased from shops for 100 gil.
 * In your Regalia shop after Chapter 3
 * Hammerhead - Mini-mart
 * Coernix Station - Alstor - Shop & Cafe
 * Coernix Station - Cauthess - Shop & Cafe
 * Lestallum - Shop & Cafe
 * Old Lestallum - JM Market

Usage
Repair Kits are used in broken car sidequests. Keep a couple in your inventory at all times.