How much are the golf balls? They are pretty good, I wouldn't use a golf ball as advertising though, associates you a bit too much with "goofball" 
The golfball packet has the adress (GeorgeWBushStore.com).
Anyway, they're $10.
Beyond the golf balls, signs, hats, and shirts I mentioned, they've also invested money into Bush/Cheney buttons, stickers, fleece scarfs, keychains, mugs, glasses, license plates, balloons, towels, duffle bags, mousepads, etc.
Also, I don't think I would like people playing golf with a ball with my name on it, it is sort of like when people tell you to imagine the ball is the head of somebody you hate.
I bet more than a few liberals have bought those balls just to smack George W. Bush and Dick Cheney about a bit
.
