Nikon D850
Nikon 105mm micro G VR
In all seriousness though... your requirement for good DOF in a small package and costing $150-$300 makes this difficult.
Sony's mirrorless line would probably meet the size requirement, but I don't know about price. It would blow the budget, but a used A6000 + vintage Nikon 105 2.5 AI would work (or a vintage Nikon 55mm micro) . Maybe someone here knows more about Sony and if there's anything older than the A6000.
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