As you all know, photography is an expensive hobby. You also know, quality lenses are required for taking quality images. The price of a lens depends on its focal length, speed, construction, the type of glass used, and manufacturer.
All manufacturers produce affordable lenses for beginners on a limited budget.
You can buy new lenses at reasonable prices and still get quality results. Budget lenses are not as fast as pro versions of the same focal length. Professional lenses are made to withstand heavy use with better optical quality. This is especially true with telephoto lenses. Both zooms cover most popular focal lengths in a pair of light and very affordable package.