To have a shop change your spark plugs expect to pay around $150.00 for parts and labor.
I had my spark plugs changed out last year at a shop and I was charged $150.00 for parts and labor.
My husband usually changes spark plugs but in my Van the spark plugs were really hard to get too so I had to have a shop change the spark plugs out and it was well worth the cost of $150.00 to have them changed.
Spark plugs when my husband changes them costs around $50.00 so if you can change the spark plugs yourself then it will be cheaper but sometimes they can be hard to change.