Hi! Being a mere college student, I am continually looking for ways to cut costs. Currently, I use Everclean cat litter, but I'm curious to find out if any of the cheaper brands (Step Fresh, Arm & Hammer, etc.) are any good. I'm a bit leery about the quality of those sold in supermarkets, and also worried about high amounts of silicon (I read in TCS that silicon can be damaging to cats, and even their owners). So I just wanted to know if there are any "cheaper" brands out there that work well. Ideally, I'd like to try World's Best one day, but for now, I'll have to settle for the less pricey stuff!