i got my illuminas for my old accord for $365 shipped off ebay. they were an awesome shock. id def suggest full coilovers tho, if you wanna go a little above the $500 mark.
Omni Power Coilovers are pretty cheap... although i dont see them on ebay anymore... i remember seeing some for $550 shipped
an alternate route would be searching around different forums for a good deal on a used set like someone above mentioned
if you don't mind buying used.. just wait for a used set of coilovers.. people usually let em go for around 500. and if you want to buy new.. looks for a set of omni power coilovers.. i've seen them around for under 600 shipped. someone posted a link to where they were being sold, i forget where it was posted though
you guys gotta stop getting boners over teins. theyre really not **** anymore compared to whats available. and i didnt say they were overpriced, i said theres better out there for the same price or less.