How much should it cost to replace spark plugs put in a 2003 Jeep Liberty Sport 3.7 vehicle?

I have had one estimate at around $125. Seemed kind of high to me but wasn't for sure.How much should it cost to replace spark plugs put in a 2003 Jeep Liberty Sport 3.7 vehicle?depends what kind of plugs, if that includes wires and what not id say thats about right though