try your local family dollar...or other dollar stores...the howlers are noisy but tough to launch given that the "howler"part sticks out from the sides...you might do better with just the straight nerf vortex type mini footballs...
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O Lord,thou knowest how busy I must be this day.If I forget Thee, do not Thou forget me.
-Sir Jacob Astley ,Battle of Edgehill,1642