Where to buy this!

Im thinking of doing a gender reveal and want to do this since we’ll be finding out next month, October! But I can’t find a smoke bomb that does it on its own. Everywhere I look it’s the ones you have to pull something 🤦🏻‍♀️ do you guys have an idea of where I can find one where I can light up and put it in the pumpkin and not worry about anything else? Like the smoke just comes out on its own once it’s lit up.