Roll your windows down all the way and it's a lot easier to pop them in & out. Be careful though to not bend them too much. IIRC, I paid ~$15 for the front drivers side piece about 4 yrs ago from the dealer. Oddly, this one piece is bulging again.
Bless our servicemen & women overseas.
L.Cpl Ian Malone, 1st Battalion Irish Guards, R.I.P.