Bose' official eBay store is currently offering up its QuietComfort 25 wired headphones for just $169. This is $130 off of the regular price of $299. These are also brand new models of the QuietComfort 25's and not refurbished models, which makes them a great price for those looking for a new pair of headphones.
The Bose QuietComfort 25 headphones are a pair of wired headphones that do offer up noise cancellation, which is great for traveling and such. These are wired, however, so you'll want to make sure that your smartphone does have a headphone jack, otherwise you'll be making great use of that USB-C dongle that many manufacturers are including in the box with their smartphones these days. These QC25's do offer up some great audio, which is what you would expect from Bose, and there are also inline controls for play/pause and controlling the volume.
eBay is offer these with free shipping and no taxes being collected. So that means you're paying $169 out the door. Additionally, these are shipping from Bose' headquarters in Framingham, Massachusetts, so those that are closer to the east coast will get these sooner than those on the west coast, as this is free "standard" shipping and not expedited shipping.