You might think Iowa's biggest export is corn, but it's actually soybeans. With this knowledge, you're well on your way to contributing to the agricultural industry. With a commercial driver's license (CDL), you can really get started in this career path. In Iowa, we're lucky enough to have some of the most affordable rates. Regardless of whether you want to drive a Class A, B, or C vehicle, you'll pay just $8. For added endorsements, these are either $5 or $10 depending on whether you want to drive passenger buses, air brake restrictions removal, tank vehicles, school buses, hazardous materials, or double/triples.