I feel like sleeping on an organic mattress is very important to your families health, as you breathe in the toxins. Using organic clothing, sheets ect is healthier as they do contain some chemical residue, but even more so for the planet in not dumping pesticides ect. Choosing to buy from a conscious, fair trade company is a choice you can make to create a better world. Discount stores do not always provide a truly clean product (no chemicals added in processing) or act responsibly in manufacturing. But if they are truly buying organically grown cotton it is a step in the right direction. Which of these you can afford to do, or you care about is a personal choice.
We buy most of our clothing and household goods used at thrift stores, yard sales and e-bay. That way we can spend the savings on organic things like underwear, mattresses and sheets. We try and buy from conscious small companies whenever possible.