I bought a buffer for $12.
I've been there before and they had packages of assorted foam brushes for a penny each.
My HVLP is one of their Speedway Series guns. Looks just like the HF gun.
If you can ever catch them when they have the fountain pump for $10, its a great buy. I built a parts washer from an old sink and a 55 gallon barrell. It was perfect for it. I mounted it at the bottom of the barrell. It pushes water through a 3/8" hose 5 feet vertical with plenty of flow.