With a little planning and effort, you can give your home a modern update for less than a few hundred dollars. The trick is to find affordable products that are genuinely worth the price tag. But if you aren’t sure where to start? Don’t worry: All of the home improvement products you’ll find below not only have near-perfect reviews, but they’re so popular that many of them keep selling out. Take the privacy film I’ve chosen to include as an example. Not only is it available for less than $15, but so many reviewers even left comments about how it helped lower their cooling bills. And if your windows are…