Invega Prices. This Invega price guide is based on using the Drugs.com discount card which is accepted at most U.S. pharmacies. The cost for Invega oral tablet, extended release 1.5 mg is around $1,070 for a supply of 30 tablets, depending on the pharmacy you visit. Prices are for cash paying customers only and are not valid with insurance plans. A generic version of Invega is available, see paliperidone prices.