Compare prices at different pharmacies. Some pharmacies may have lower prices on Percocet than others. You can also compare prices online. Just be sure to read the fine print so that you are getting the best deal possible.
Ask your doctor if you can buy Percocet over the counter (without a prescription). Your doctor may be willing to let you purchase Percocet this way if it is not being used for an extended period of time and you will only use it for short-term pain relief.