There is a lot of misinformation out there about whether or not Dick's Sporting Goods drills holes in bowling balls. The short answer is no, they do not. However, there are a few things to keep in mind if you're considering buying a bowling ball from Dick's.
First, while Dick's may not drill the holes in your bowling ball, they will likely put the finger inserts in for you. This is usually done at no extra charge, but it's something to be aware of. Second, if you're looking for a specific type of hole pattern or layout, you'll need to specify that when you order your ball. Otherwise, the default layout will be used.
Finally, while Dick's doesn't drill holes in bowling balls themselves, they do sell pre-drilled balls. So if you're set on having your new ball drilled by them, that's an option too. Just keep in mind that it will likely cost more than if you had the work done elsewhere.