Well, most macro lenses overrun your budget, a Sigma 50mm starts with nearly 300€.....
Within your budget I only know the Cosina 100/3,5 macro (also availabe from Soligor). I have not tested it, but you can hear/read always the same comments: cheap chassi, cheap "feeling", slow AF but good optical quality.
Or buy extension tubes, less comfortable, but less expensive. For the Nikon a set of 3 tubes should be somwhere around 100-150€.
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