Built In Refs
The KAs came out in 1990, overall they are very well built refs, generally better than Sub-Zeros, and differently better than about any other BIR especially GE.
BIRs over the last 20+ years are anywhere from $4000-10,000 new usually averaging around 5-7 thousand, plus expensive either factory optional or custom panels+ installation costs. custom wood panels can easily run $3000 or more.
KA and GE BIRs are very common with through-the-door Ice&Water dispensers.
BIRs are usually installed as part of an expensive remodel or new house build.
They can be a great buy used as there is very little market for them as used appliances.