King springs list a model for our cars, but they are not designed for our cars. They are simply springs that fit and are the wrong spring rates - avoid like the plague
No other local company list springs so your option is JDM via importmonster, Jesse Streeter etc.
Tein,
Tanabe
RS-R
all make springs. However, given the age of these cars, shocks are likely required too, and then you are into the cost territory of coilovers. BC's can be had for $1300 delivered and are a good option
Tanabe GF210's can be had for around $300 delivered via import monster (thats what I did). A little bit harsher ride than stock, but perfectly driveable as a daily. I have mine fitted to bilstein mono tube shocks, and can't complain.