Buying 20 mg Oxycodone without a prescription isn't difficult, but it does require you to be aware of some important facts. First, it's important to understand that oxycodone is not approved for use in children or teenagers under the age of 18. Second, although many people assume that buying oxycodone online will be less expensive than buying from your doctor or local pharmacy (it's not), there are actually some situations where this is true--such as if you are buying your drugs from overseas countries where laws on distribution and sale are less strict than those at home.