There is a website in Japan, goobike.com, which lists all the NSRs currently for sale in Japan (I guess dealer + private). From what I can make out from the partial google translation, prices for MC21 & MC28 SPs range from £2000 - £4800 (Yen equivalent). I have not looked at the R + SE models in enough detail yet.
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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30