If you want it cheap they won't care about you. You get what you pay for. The NTB on 41 near Windy Hill (across the street from Dobbins) is typically open pretty late. (9pm I think?) When I worked at that Jiffy Lube they were there well after we were leaving. Speaking off, both Jiffy Lubes on 41 in that same area can probably have you in/out pretty quickly if you're getting there around 6:30 (I assume they're still open to 7 at least, been several months since I worked there). If you ask any of these places they will gladly take a look at the oil leak (They're pretty much staring at it as it is) and give you a general idea of where it's coming from.