last one you'll ever need

That is a professional compressor and at the end of the day, it is the least expensive way to go for high pressure air. When I outfitted my bare Bauer pump, I had to acquire all the safety valves, high pressure fittings, stainless tubing and high pressure switch. I found sources in Australia that were pretty friendly, but the safety valve and the control switch were more $100 each. On top of that you have to build manifolds to house gauges and connectors, a DC power supply and a power control relay for the motor. There are very good reasons why these compressors are expensive, but when designed right, they perform flawlessly for many. many years.