Gas and Oil Home Heating Furnaces - Empty tank; alternatives to heating oil?

We are selling our house and the home inspector could not get the boiler to run. Looking at the tank, it appears we are comepletely out of heating oil. We already terminated our oil contract, so the fuel companies we called want $75 to come out and service it. On top of that, they'll won't sell us less than 150 gallons, and it'd be an increased rate to boot. Since that would basically be wasting money, I'd really like to try another tack. (I also don't want to try to pass the cost on to the seller. They've already been accommodating.)

I heard somewhere that plain ol' gas station diesel will do the trick, but I do NOT want to screw anything up. Any other alternatives? Some place I'm not thinking of that would sell me a small supply?

I'm in Baltimore, Maryland, if that helps.

I used 5 gal of diesel once when I ran out on a Sunday with no ill effect, it just cost a lot more. :)

Diesel or kerosene will work just fine.