This is awesome, and should serve as a incentive to others to try to repair broken kit.
Brett did the whole thing for a little more than $20, but you can do it for even cheaper, depending on where and from whom you buy your kit. The five small tools in the first photo with Brett were all sent with the replacement screen, as was the replacement precut double-stick 3M tape to affix the new screen to the body of the iPhone. Total cost of screen, with tools and tape plus shipping and handling, was $21.95. Brett's father notes that he chose the seller because he had "very good comments and was in New York, so I knew I would get it quick."
The whole operation took about 40 minutes. Brett's father pocketed the $178.05 in savings, and claims he'll put it toward the boy's future college tuition. A likely story.
Wondering how to take your iPhone apart? The guys at iFixit have a wonderful tutorial!