Reddit reviews Foundation Repair Manual (McGraw-Hill Portable Engineering)
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That is way cheap - normal cost is in the range of $1500 a pier, which would be $19,500.
What kind of piers are they going to put in? How will they install them?
The best are drilled concrete piers, there are other alternatives that work but are not as durable. Any of the metal piers are likely to fail within 20 years or so. To better understand the issues, read Robert Wade Brown's Foundation Repair Manual https://www.amazon.com/Foundation-Repair-McGraw-Hill-Portable-Engineering/dp/0070082448
I would NOT have the owner make the repairs, get the money and do it after closing. The warranties are usually not transferable, so you will typically get a lifetime warranty if you do it, no warranty if they do it.
Best advice is to have a PE structural engineer design the repair, then have contractors quote to do that repair, then have the PE confirm the repair was done correctly.
Most piering contractors do not have an engineer design it, they essentially exploit a loophole in the building code. Some do a decent job, but most do not. Be VERY careful in choice of contractor.