i have a set of cheapy ebay coilovers (pretty much identical to ground control, i believe... even spring rates) for about $40... they were just springs with threaded collars and 2 "perches" that locked (with tools). They were meant for a miata but slight modification to the strut housing allowed the collar to slide over.
The only downside is that the strut perches on the front and rear are different.... so I have the front as low as possible and the rear as high as possible.... kinda bouncy with blown struts, but the handling is actually quite great all things considered.