I'm on Ebay coilovers right now called "Dropzones." Not designed for performance, just designed to drop your car for as little money as possible. Fortunately, it is a shock and spring combo, not just a sleeve, but believe me when I say they are actually awful. I got them extremely cheap, and otherwise never would have bought them. In fact, I regret paying the small amount of money that I did pay for them.
Ever been in a rough riding car? Imagine a vehicle with no suspensiona at all. Basically a big co cart. That's my car. I have a Tylenol 30 minutes before I drive anywhere to prepare myself for pain ahead.
Mine creak and grown and have broken in a couple different ways. My stock suspension is going back in as soon as possible, which is exactly how my car will sit until I can afford a better setup.
Don't bother with Ebay garbage. You will waste your money, your time, and possibly labour costs of putting them in and then pulling them right back out. Like others have said, consider yourself $100 closer to your real setup, and don't bother.