There is a long list of things that are exempt from sales tax. These include:

1. Purchases made by manufacturers, is the item is a component of what they manufacture.
2. Sales of livestock, or feed for livestock to be marketed.
3. Intrastate transportation of sick or injured people by ambulance.
4. Intrastate transportation of employees when the employer pays for the transportation.
5. Intrastate transportation of freight and passengers.
6. Intrastate transportation of raw farm product to processing plants.
7. Sales of energy consumed in manufacturing, processing, or agriculture.
8. Sales of the services of professionals.
9. Sales of cigarettes (since there's a special cigarette tax).
10. Sales to the State of Wyoming or political subdivisions.
11. Sales to religious or charitable organizations.
12. Sales of certain vehicles to holders of ICC permits.
13. Sales of prescription drugs and many other medical supplies.
14. Sales of mobile homes, after sales tax has once been paid by original purchaser.
15. Wholesale sales.
16. Sales of newspapers or school yearbooks.
17. Sales of gasoline (since there's a special fuel tax).
18. Sales of food purchased with food stamps.
19. Admissions to county or municipal recreation facilities.

What's a sales or use tax?
How much sales tax do I pay?
When does sales tax have to be paid?
What if I Purchase a Vehicle Out of State?
Sales Tax Example
What if I won the vehicle or it was a gift?