2017 v 105,000 miles, how much should spark plugs service cost?

Depending on how much and how long they are charging you in labor, spark plugs should cost you around $40 and rest will be labor to take off and put back all the parts in the engine bay to get to the spark plugs..

Normally it took me no more than an hour to change out the spark plugs...

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I just did my own spark plugs at 124k,using Nutz About Boltz's video(s) on this website. Cost me twenty something for Bosch Double Iridium plugs and a fair bit of elbow grease and perspiration. It is definitely doable if you know your way around some tools.

The only other things that I had to buy was a new spark plug socket, some copper anti-seize compound, and some dielectric grease.

All in, less than $50. More, if you add in the requisite number of beers consumed (to replenish fluids lost through perspiration).

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yeah, that's pretty pricey. i'd say $200 is fair, $250. at a dealership

 

Looked up a spreadsheet I have on cars I have owned.

Last Toyota spark plugs replaced at dealership cost $157 for a Toyota Corrolla. irridium sparkplugs.

That's in Canadian Dollars so about 157 Canadian so about $125 US.

$400 is a ripoff.

 

This might be helpful:



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The Prius requires removing the windshield wiper assembly to get to the spark plugs. This is a PITA, and adds a lot of labor cost over a normal car. I don't know Corollas, but a Corolla might be straightforward to remove the plugs. The cost for a plug change in a Corolla might not be a fair comparison.

Also, buy the plugs from the dealer. The dealer plugs don't cost that much more than aftermarket (~$40 for 4 plugs). My dealer has them on sale for $8.88 each:
https://parts.conicellitoyotaofconshohocken.com/oem-parts/toyota-2008-2020-toyota-spark-plug-9091901275

Given how hard the plugs are to replace, why take a chance with aftermarket? Get a local shop with lower labor rates to install them.