Cost of nitrous oxide: Costhelper.com estimates N20 sedation to cost as little as $25 at some dentists, while Delta Dental’s Kohn says N20 alone may cost $200 or more depending on the practice.Click to see full answer. Herein, how much extra is nitrous oxide?How much does it cost to have nitrous oxide at the dentist? The average cost to the patient for nitrous oxide is $50. Some offices charge this fee on a per-hour basis, and some charge it on a per-visit basis.Secondly, how much does nitrous oxide cost for your car? A nitrous kit generally starts around $500, and even with several accessories is still just a fraction of the cost of a supercharger. The second advantage is, unlike a supercharger or turbo, nitrous cools the intake air. Similarly, how much does a tank of laughing gas cost? For G and H tanks, it is $95 per tank, resulting in an annual charge of $380 for two tanks of each gas.Can you purchase nitrous oxide?Nitrous oxide canisters made for the purpose of prolonging the shelf life of whipped cream and other products are completely legal and readily available. Anyone can buy these without a permit. Supply of nitrous oxide for recreational purposes is illegal under the Psychoactive Substances Act 2016.