Unsure exactly where to put this.

I'm trying to make my scion a bit less loud (I tend to do a lot of highway driving) and I've sound-deadened the doors, which helped a lot, but there's still some wind whistling, which is probably coming from the doors/weatherstripping. I'm trying to look into getting the issue fixed on a lower budget, so I was wondering if anyone else has a good diy to fix this issue?