Base price based upon labor at $90/hr. Time if shop really knows what is doing near 12 hours. That's from start to pull it out to back in and rolling.

I'd concetrate on other causes rather than the rings. Bad rings usually only if ran dry of oil or lack of oil changes gummed things up.

The 150 is about right for that amount of miles on a B230. I've had three and after 280,000 one one: 200,300 on a second; and 230,000 on one that went to Valhala, lowest compression was 145, highest was 160 with range of 10 between high and low.

Duane