A Bluetooth speaker is an item found on many wish lists, given how many of us own a smartphone and a music-streaming subscription of some sort. Kids can link them to their handheld video console the game; The teens take them to shoot hoops at a friend’s house; And adults drag them out for their backyard barbecues. Many of them are water resistant and offer great sound and long battery life. And this time of year, you can often find a good deal on a budget, too. Here are the best Bluetooth speakers—for under $100—that you can still buy before Christmas.