Compressor manufacturers now run their machines at higher speeds than they used to, which equates to shorter compressor life and reduced efficiency. I have two IR Type 30 air compressors that are probably from the 1960's / 70's. Each uses 1800 RPM motors versus the 3600 RPM that are common today, and each was basically in good shape when I bought them.
My smallest is a 2 HP with a 60 gallon receiver. I bought it for $ 100 with a bad motor. While I was at it, I tore down the pump, honed the cylinders, ground the valve plate, and installed new valves. It is my base compressor, and handles chip blowing just fine.
If it can't keep up, the 5 HP Type 30 kicks in. This compressor was in excellent shape when I bought it - price was $ 900. It also got a basic overhaul with new valves.
I don't know how parts availability is for new compressors, but every part I needed was in stock at the IR dealer, plus available on line from various suppliers.
IMHO, you are far better off buying a used quality compressor than buying an oddball brand, plus an older compressor runs slower, which means higher efficiency plus longer operating life. Slower compressors also deliver cooler compressed air.