By Sydney Lupkin When TrumpRx launched in February, it joined a chorus of websites claiming to have deals on prescription drugs. Despite the hype, many of the medicines on TrumpRx include brand-name drugs that patients can find cheaper elsewhere — as generics. For instance, Protonix for heartburn and gastroesophageal reflux disease is available for $200 on TrumpRx. But the generic version, called pantoprazole, cost less than $30 with a coupon from GoodRx, another drug discount website. And depending on the health plan, using insurance could mean a $5 or $0 copay. So with sites like TrumpRx, GoodRx, Mark Cuban's Cost Plus Drugs and a dizzying list of patient assistance, copay cards and even cash options from the drug companies themselves, what can you do to make sure you're getting the best deal on your prescription? Well, there are no shortcuts, and it's going to take a little work to figure it out.…