Amazon has Zuru Bunch O Balloons Slingshot w/ 100 Water Balloons for $5.99. Shipping is free w/ Prime or on $35+.
Note: Reviews are mixed, but they do confirm that this includes the slingshot. Select Amazon accounts may qualify for an Extra 20% Off coupon found on the product page, making the price $4.79 (not all accounts are eligible).
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