Amazon. Eight of
THESE and two of
THESE on the inside of the windshield. Used 10 of
THESE sewn into the screen in pockets. Stuck to the windshield with double-sided tape. Don't try and save money with weaker less expensive magnets. $100 worth of magnets plus $31 for the material. I think I spend another $10 for the hemline material. $140 or so all total. The two big magnets go in the upper corners and have to be strong enough to hold the shade while you are getting it into place.
To give you a better idea watch
This You Tube video.
Feel a bit guilty passing along the info, particularly the video. Magna Shade has some really nice products, I just couldn't afford to buy what I wanted.
The magnets are VERY strong. Get a bit of skin pinch between two and they will raise a blister. They can shatter if you allow two to jump even a few inches and crash into each other.