Is $24,000 to repair a detached garage foundation a fair price?

I am currently in my inspection period on a home I am hoping to purchase as a first-time home buyer. The inspector had concerns over the detached garage foundation and suggested I reach out to a foundation specialist. My inspection period is over today, so I need to make a decision quickly. I am waiting on an estimate from one other foundation contractor. I am trying to decide if this issue is significant enough to walk away from the purchase or if I should ask for a seller's credit. The house has many other recent improvements, including a new roof, HVAC, furnace, and water heater, and the sellers will be relining the sewer before closing.