The colors listed on the color match chart are exact matches, not 'close' and will work perfectly.
To explain a bit about cost, the process we use is proprietary and comes from 7 years of plastics development and painting process development.
If you were to find a plastic part to fit, then try to paint it, the paint may look great for a few days, but will release from the plastic. Others have tried, we just put more into it during trials to make absolutely certain the paint would stay, and was factory-chemistry, not some knock-off.
Painting this with touchup won't hold either. The 14-layer process we use assures us and our customer that the product will last, and will look just as good years from now as it does on day one.
Again, if there is demand for dual-packs, or tri-packs, just email me. We will work something out to help this Scion community.