try ebay. I am sure there are some online shops that sell them, but ebay would be the cheapest.
IMHO, I wouldn't fit them. the headlights in the S15 (non HID) are pretty average to begin with, as soon as you fit the eyelids the will cut down on long range illumination as what happened to a friend of mine. He couldn't work out why he couldn't adjust his lights up to get better light from his headlights. I then reminded him he had the eyelids. Actually it's pretty common to adjust the lights up to get a better light spread.