You have various options
new stuff
Ajustable shock inserts $254ea
Non-adjustable inserts $90-$180 ea depending on quality
Uprated springs, slightly lower, increased rate $99ea
bump stops with gaiters. needed on most cars $33/shock
used stuff
Uprated springs, about 30mm lowered,$55ea used .
Pair tein adjustable rear coil-overs, ready to fit $500
Pair KYB adjustable gas rear shocks $165 pair
I probabaly have more sued stuff if I start digging. let me know.