When it comes to buying a laptop or desktop computer, there is a big difference between "used" and "refurbished." When you buy a used computer, it basically means you’re getting it in as-is condition, with no idea how damaged or usable it really is. But when you buy a refurbished system, it means the system has been repaired (usually by the manufacturer) and even comes with a warranty and tech support. The great news about refurbished computers is that they are less expensive than new ones. Often, these systems are technically new; they often come as returns from major corporations that barely cracked opened the box.

While it may be economical and ecological to buy lightly used items online or from thrift shops, there is one item a parent should never buy used: car seats. The safety regulations for car seats are constantly changing, as crash test results reveal new ways to improve them. The designs for car seats change so frequently that they are often stamped with an expiration date, lasting only about six years after purchase. Since car seats are designed to withstand only one crash, there also is no way of telling if the seat is still usable or not. For the safety of your child, buy a new seat.

Being cautious about lead exposure in your home is even more important when you have small children. Beyond lead paint, there are many common items that may contain high levels of lead. According to the Mayo Clinic, parents should be cautious about giving their children candy from foreign countries; some foil wrappers still have traces of lead. And if you hunt for your own game, be aware that wild meat like venison may contain lead; bullets are often made with lead, and lead particles can end up in the meat. Any glazed pottery, especially terra cotta style, should be avoided; these pieces are often marked “for decorative purpose only” for a reason, since the glaze often contains lead.