Everyone seems to be in the trade-in business. Recently AT&T started a trade-in promo, and now HTC is looking to do the same for this weekend to boost sales of its flagship device. The expanded promotion is available in the United States and Canada for this weekend only.
Anyone who buys a new HTC One between now and May 5 is eligible to trade in their current smartphone for a minimum of $100. Some devices, depending on age and condition, are eligible for up to a $375 credit. It's obviously a better deal for those with extremely old smartphones as $100 is likely higher than the going rate on Ebay.
To get the full details and rates, check out HTC's promo page.