Cool post, it is funny imagining these things coming out new from the factory. I remember my dad picking up a Z31 and I thought it was the best thing ever.
Using
http://data.bls.gov/cgi-bin/cpicalc....990&year2=2014 , the 240SX sold for around $13499 in 1990, which equates to around $24,584 now. Interesting to put into perspective. The FRS really isnt too far off.