I checked the ANA web site and found the following four dealers near Port St. Lucie: Charles W. Rossman - Port Saint Lucie James Warmus - Palm City Anchor Rare Coins Inc - Stuart American Premier Numismatics - Stuart
I cannot vouch for any of these dealers. All I know is they are ANA member-dealers.
A word of advice: If your friend has "bags of old coins" he can help himself by learning something about coins and separating out the valuable coins from the common coins. The Red Book lists all US coins made and their relative values. If your friend takes bags of coins to a dealer he will probably be paid the value of the most common coins because most dealers do not have time to sort through bags of coins for their customers. If someone has pulled out the rare dates and mintmarks he will get a better price for them than if they were mixed in with thousands and thousands of common coins.
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No state shall emit bills of credit, make any thing but gold and silver coin a tender in payment of debts, coin money . . . - US Constitution, Article 1, Section 10
ANA LM-3799; OHNS LM-59; SUSCC R-4005. All coins stored in bank safe deposit box. | 
