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Putting the cargo box behind the van instead of on top is a smart move, much better for aero.
If you're looking for something cheap and simple, you could grab some garden edging as mentioned earlier and make yourself a front air dam. If you can encourage air to go around the van rather than under it, that will improve aero.
You could also grab a piece of pipe insulation and stuff some of it into the front grille. Once again, encouraging air to go around the van instead of through the engine bay will improve aero. Just be careful not to block too much of the radiator. You wouldn't want to overheat the engine.
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