Reddit reviews Water Sports Water Balloons Refill Kit 500 ct- Biodegradable Water Balloons with Water Balloon Hose Adapter for Quick Fill, Assorted, One Size
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Contains 500 balloonsPart Number: 80086-2Balloon Refill KitFun and safe
They're not just regular balloons. They're water balloons. You're looking up the wrong item.
See here. 500 water balloons with a hose adapter for $7.99
https://www.amazon.com/Water-Sports-Balloon-Refill-500-Pack/dp/B00CEQLJ8U/ref=sr_1_14?ie=UTF8&qid=1486728727&sr=8-14&keywords=biodegradable+balloons
Here's some that I found. They aren't the specific ones I used, but I imagine they're all pretty similar. Be warned though, they aren't very great as balloons. They pop and rip super easily so you can't overfill them, but they do always explode on whatever you through them at.
So it's a trade-off between quality/durability and effort of picking up the husks.
They really do take about a full week to break down on grass, more if it is dry, and less if it rains or if you run them over with a lawn mower.