go http://www.google.com <--- here. type in "ek civic original price". that used price range sounds about right. I bought my ej8 already lowered with I/H/E with 80k miles for 5 grand the beginning of this year so its not that bad
My brother bought his 99 EX for around 15.5. All power options, no spoiler.
Price range can vary depending on the area you live in. My friend sold his 99 EX (EXACT same car as mine) with 17" rims, intake, header, apexi ws2 catback, and like 105k miles for...4500? If it's a complete rusted shitbox used as a beater, it shouldn't be worth more than a few grand.