You should call to different dealers if you have more than one near you. One dealer in Toronto wanted $15 per insert whereas my dealer here in Hamilton only charges $5 or 6.
If you want to save money, go to crappy tire or Parts source and buy some inserts or buy some wipers and remove the rubber inserts from them and insert them into your OEM wipers.
I don't know about you, but it bothered the heck out of me for those 6 months when I had those non-OEM wipers because they never wiped the corners properly.
