[url]www.autotrader.com[/url]
[url]www.kbb.com[/url]
The engines for < 10yo vehicles will last 200k+ miles, with oil changes every 3-4k miles. With a 10yo vehicle, expect maintance costs, split axles, boots, brakes, water pump, timing belt (and anything else I've missed) which all seem to go out at 100k. These costs are $2-3k for a saturn.
If the interior is in very good condition go for it.