Register your kids at KidsBowlFree and enjoy cheap bowling excursions until September.
Sign up with your kids for the lanes nearest you and you'll receive coupons every week that you must print out to redeem for two free games per kid per day.
You'll still have to pay for shoe rental at all three of the Baltimore-area lanes, but Stoneleigh also offers an unlimited shoe rental pass option.
Each bowling alley has its own stipulations, so read the fine print to be sure this deal will work for your family. For example, at Stoneleigh you can register kids up to age 18, but at the other two only those under 15 are eligible.
Also, check the times (listed on the webpage) when the coupons can be redeemed.