The HTC One M8 has been around for around three months, so you usually won't expect a discount on this device at this point. However the factory unlocked version of the HTC flagship is available on eBay for just $549.99. That is a full $150 off its listed price on the HTC website. You can grab the phone and get free shipping to the United States, and unlike some eBay deals, the seller is even offering shipping to a variety of countries around the world.
Just to be clear this is a brand new phone, and not a refurbished unit or one locked to another carrier. The seller is offering the phone in its metallic silver (almost white) and grey versions - the gold model is out of stock. If you are purchasing this in the US, make sure you use a standard GSM-LTE SIM card (wont work with Verizon, Sprint and other CDMA networks). International buyers should be able to purchase a compatible SIM and get started using this device.
Most customers won't have to pay taxes on this One M8, unless you live in Texas, because the seller is shipping from Houston. (sales tax in most states could add an additional ~$50.) The seller has listed that quantity is limited, so you would probably want to grab one soon before the deal runs out.
source - eBay