Crocheting big amigurumi or large projects like cushions and poufs requires a substantial amount of craft stuffing, which can get expensive. I found that regular bed pillows are a great cost-effective alternative for stuffing material as they are generously overfilled with 100% polyester fiber. You can consider repurposing your used pillows or exploring affordable options at a nearby department store. I frequently purchase The Blue Whale pillows from Walmart due to their affordable price and excellent fiberfill quality, making them ideal for my crochet projects.
When using new pillows, simply cut along the the seam of the pillow, take out some stuffing (as much as you can fit in your hand) and fluff it up with your fingers. Now you can use it to stuff your crochet project.
Make sure to wash and dry used pillows before taking the fiberfill out. If the fiberfill isn't completely dry, lay it on a towel to air-dry, then fluff it up with your fingers.