The budget answer is a TC-20-class tank compressor (~$100): 3-liter tank, auto shut-off, regulator, and moisture trap included. It is the compressor half the hobby started on, and its tank smooths out the pulsing that ruins line work on tankless units.
Below that price you are in tankless territory — workable for occasional base-coating, but the constant motor drone and pressure pulse make it a false economy for anyone who sprays weekly.
Go deeper in our compressors & air guides.