330i are going for pennys with low mileage.
What kind of bills can these throw?
Unless you blow the engine up entirely or you have an autobox that fails there are no 4 figure bills left on an E46 330i. There are plenty of niggly things that will over time add up to big money but massive-bill-shock is not much of a risk. It's still not cheap, 4 decent tyres for a Sport is circa £700 (No, Falken doesnt count), but it's not going to bankrupt you like say a £4k Mercedes CL might.