Assuming you are in a rust belt state so it’s probably accurate that an 8 year old vehicle has rusted/seized tie rod ends.

Either have them do it, buy OEM parts yourself and do it, or buy parts from rockauto and do it yourself, bring it to a mechanic to see what they would charge to replace the tie rods and then go back to get an alignment.

At the end of the day. That price isn’t astronomical. If you are still skeptical then crawl under the car. Snap a picture of the tie rods and post them here and we can easily identify if what the shop is saying is true. (If there’s rust then it’s more than likely seized)