There is a Silver 5/2001 S15 200SX Spec S with 85,000kms selling for $26,990 (price dropped from $31,000 apparently), but its a Fleet Sales dealership and the vehicle was an ex-company car and hasn't been cleaned/detailed inside and out. Log book also hasn't been stamped from 25,000kms to now!
There is also a Silver 1999 S15 Spec R Silvia (Jap Spec import) with 46,500kms which i might go see but hard to know if it has been maintained and stuff.
BEST DEAL yet - 2000 model 200SX (S14 or S15 not sure) with 53,000kms selling $21,500. Private sale though.