I sell used golf balls (and clubs etc) online for an actual living. I sell 100 MINT mixed value or off brand balls (Dunlop, InTech, Tommy Armour etc) for $24.99 PRIORITY SHIPPING INCLUDED. I get anywhere from 20,000 to 50,000 balls per month and would accumulate literally hundreds of thousands of balls a year that I don't have the room so I basically give them away. After shipping it comes out to under $1.50 for a dozen mint golf balls which you can't beat! No need buying expensive brand name balls at this stage of his game so honestly that is your best bet. I'm a new member here and don't want to look like I'm trying to advertise my business because I'm not. You can get similar, even better deals on ebay. The best way to to bid on assorted value brand used golf ball auctions that start at 99 cents and have no reserve. Going the buy it now route will end up costing you triple the amount. Hope this helps!