Just recently I visited the tires plus in Overland Park at 75th and Metcalf. After the salesman gave me incorrect reasons to not balance my trailer tires, I them do it anyways.
They quoted a price to balance the tires, but did not quote prices for parts (Tire Weights). I'm fifty years old and have never had to pay extra for tire weights before. Amazingly enough, they charged for 'parts' to balance the tires.
I went back after I realized the gouging I got, but they only stated the one little weight they put on each tire was 'expensive'.
Don't go there unless you want to get taken and get wrong information.