I bought a brand new MC21 sprocket a few months ago for about $70 I think. You can also get sprockets custom made from Sprocket Specialties. I think you can also get sprockets through NSR-world.com. If you aren't willing to do business overseas on the internet, then you should probably not own a NSR. I don't know why your so worried about doing business over the internet. That guy trying to sell you the sprocket for $300 is the one who is ripping you off, and he is doing it in your face.
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james
Its not how fast you go...Its how you go fast.
MC21 Rothmans
RS250
RC31
CRF250X
748R
Porsche (many)
http://members.rennlist.com/j911brick/rennlist3_002.htm