Unfortunately, there's no such thing, at least if you want them to last, and be functional.
Second hand ones could be a big problem too as they'll most likely be old so, require a rebuild. Finding someone to do that (unless they're Tein's) is the first issue, then at around £100 a corner to rebuild, you'll end up paying more than you would if you'd have bought a new set.
Personally, I'd recomment Tein for two reasons:
1, the spring rates are great for a road car and they'll be plenty of adjustability for you.
2, You can get them serviced in the UK, in Milton Keynes to be precise. That will also help if you have warranty issues.
If you can't afford them now, save up for them. It'll be worth it.
If you want to go a bit cheaper, I have D2's with softer than specced springs. I like them a lot but, I'm always worried about issues with them.
Paul