Strut bearing

[sw9mm]

I got a 2010 sentra with 58000 miles on it. Have a clunking when low speed turning and a sproing when turning wheels at a stop. It's been slowly getting worse for the last 10000 miles. Took car to dealer and they said I need new strut bearings,insulators, and caps. Total est Cost is 600 bucks. I know there is a TSB on this. Does this sound like a fair price for this it seems kinda hi? Will Nissan pay any of it? Seems like a lot of people have this problem and at low miles. And from reports these bearings might not last that long before the steering noises come back.
Thanks for any replies or experience you can share...

[sw9mm]

Service guy did say since I have purchased 5 cars through them he'd give me 100 off coupon. Kinda good...