You do NOT see a linear regulator, that is a switching regulator. A linear regulator handling the power you're talking about would be a hot potato! The ferrite coil you see is the inductor for the switcher, the LM2596HV chip. It will run MUCH cooler than a linear supply and also handle way more current than a linear supply that's anywhere close to this size.
Truthfully, do you really think you can do better for $3?