Don't worry, you have found a company that does not charge an arm and a leg. We do springs as low as $140! Bigger companies like A1 and Precision Garage Doors charge $360-$450!
Oil-tempered springs are made of high carbon steel wires, which are filtered through a sequence of dies until the proper thickness and shape is achieved. The spring is then run through a series of heating cycles that are tempered with oil until the desired tension is reached. The end result is a spring that's strong, flexible and durable.
Don't want your car stuck again? Get the High Cycle Springs! They last 20+ years!
So relax. They won't break again for another decade or two!