As a spring maker that makes perfect sense to me. If we made 100 springs for ace hardware they'd be expensive compared to the 500,000 springs we made for a door company, even though the door spring is bigger. I would recommend doing what dlaery did, find a cheap off the shelf product that has some springs that look like they'll work, or strip any useful parts from your old printer, vacuum, or windshield wiper blades before you throw 'em out. Springs are everywhere if you look for them.