Lexus es300 1992 shocks and struts full price with complete installation service?

i need to know the price on shocks and struts specifically for this model of lexus. i need to know the price for installation and if there is a difference in pricing from car shop to car shop. i went to discount tires like a 1yr ago and they told me the struts are like 80$ and the shocks are around the same but he didnt tell me the pricing on the installation as well. ps-if you can also tell me an average price for a tire and if it's really worth it to buy used tires due to monetary problems... thanks in advance :)