Brad Bourque Brad Bourque is a tech journalist and commerce writer based out of Portland, Oregon. He’s contributed to sites like Digital Trends, Business Insider, and WIRED. I like the UE Wonderboom 4 Bluetooth speaker so much that I bought two of them, though I wish I could have paid less for them. Fortunately, you can stock up on the cheap, so long as you like the color blue. The Wonderboom 4 is available in blue at Amazon for $51.49, and at Walmart and Best Buy for $51.99 ($28 off its regular price). That’s the lowest price we’ve seen yet for the waterproof speaker, with most of the other color options selling at a slightly higher (but still discounted) $69.99. $51 The Wonderboom 4 might feature a compact design, but it still delivers big sound for its diminutive size. It also carries an IP67 rating, meaning it’s both water- and dust-resistant (it can even float if you need it to).…