I was just after lighter Tien springs for my R34, they wanted $650 + Del. For rebuild I reckon they ask at a mininum $150 a shock.
SAU have a gp buy going on for Bilstien & White Line springs (for R32, R33 & R34s), they are around $1200 deliverd (4 shocks & 4 springs) & sold my Tiens on E-bay for $900, so new suspension only cost me round $300.
Tiens are O/K if there are on a track car but on Tassie roads they are crap! rattle & knock plus way to stiff! IMHO.