Ahh, youth baseball. BTDT; this Spring is, in fact, sadly the first season that I WON'T be coaching one of my sons' baseball teams in about 9 years.
The latest-and-greatest bats have been quite expensive; we had good luck online (Just Bats is a great site), and locally both Sports Authority and Dick's has good sales from time to time. Our best success was either online or getting a slightly used GOOD one from Play-It-Again Sports, if you have one of those near you. Have fun shopping with him! Get him some new batting gloves, in a color combination that will match his team's uniform. Teenaged boys dig new batting gloves, and they're CHEAP compared to bats!!