There’s no question that Bose’s last-gen QuietComfort Ultra are some of the brand’s best noise-canceling headphones, especially if you’re a frequent traveler or someone who values peace and quiet while listening to your music. But at $429, that quality doesn’t come cheap. However, it’s cheaper today thanks to Prime Big Deal Days, albeit only for the boldest (best, some may say) color scheme in the lineup. You can currently grab the wireless headphones in the deep plum color for…