I got my new Outback reinspected. So all my vehicl...

I got my new Outback reinspected. So all my vehicles will be due for inspection in July. The guys were great and did a good quick job. I had another issue with the wipers and they tried to address that as well. No complaints with the service. But the sales department sent me a bill for $36.50 more for the registration fee. I paid the $36.50 but I'm wondering if that's legal. Since i have an agreed to contract for the price of the car which included the registration fee. I'll have to contact the better business bureau to see if this is legal. Plus my buddy's brother the lawyer might want to have some fun with this as well.