I got mine at Les Schwab, dont recall the price but they were able to get the tires and install done within a week. Make sure you get load range "G" tires, some 19.5's are F which have a capacity of 3640lbs, G has the capacity of 3970. If you are going to drop the coin for 19.5's get the biggest load range you can.
Make sure you verify that you have the right load range when you are at the dealer. The first set they got for me where F's and they didnt notice it, I found out when I got home and looked at the tires, and then had to go back