This is strange to read... that Eibach has discontinued making springs. However, I have been using coilovers for the better part of 8 years and replaced my setup 3 times - due to very bad roads and a 20V engine swap, and perhaps not the best spring/shock combo.
I've been using Ground Control coilover springs and KYB shocks. Eibach supplies these springs and in conjunction with the sleeves from Ground Control, you can have stock ride height or lower by 2.5" -front and rear. I've not had a problem locating these and buying them. They cost on average US $400 shipped. If you have good roads, maybe they will last you a lot longer than mine, and the performance is outstanding. No leaning and swaying AT ALL on 15" wheels. You can nail the accelerator into a corner, get uniform wheelspin on both tyres, better launches and improved stopping power as the hard springs do not compress easily when the car's weight is being thrown onto 1 side. If you are into racing, these improved effects will shave a fraction of a second off your times. Watch out for oversteer as turning response is also a lot quicker.
One more option you can look into is Gecko Coilovers which is a spring and shock combo. I've never used them before, but they are becoming increasingly popular, and price point may be an indication that it's not "cheap" in every sense. Gecko makes coilovers for all applications and there are claims that they provide versatility and handling options for even the big brands - like BMW, Mercedes-Benz, Audi, Lexus, etc..