Let's see here. On my first motorhome, we used shades as Robert described. It worked fine. On this bus and the one before, there were already tracks installed, but the curtains were way past their prime, so they were replaced. If you do a search for RV windshield curtains, you will find them in the range of $100 or so. Aside from wanting to save some money, I did not like those because of the thickness. When we are on the road, I bunch the curtain up and tuck it into the valence rather than letting it hang down. Therefore, I wanted something that was really easy to handle. We bought some truck windshield curtains on Ebay that worked fine, and they were less than $30. Curtains, of course, do not follow the angle of the windshield; they just hang down over the dash.
I would point out that using a windshield sunscreen as you are doing does not take anymore work than using curtains--maybe even less. It is really as good an option as most from a practical standpoint.