From today onwards until the end of this weekend, customers who pick up a new HTC One and trade in a qualified smartphone are able to be on the receiving end of at least $100, and depending on the smartphone model that you decided to drop off for a trade-in, as much as $375 for your previous device. Known as the HTC “One Phone, One Weekend” offer, it is available from May 2 through May 5, and will be applicable to any HTC One that is picked up via a U.S. carrier, namely AT&T, Sprint, T-Mobile, and Cincinnati Bell, or through a national retail store. You might want to get a mophie juice pack to go along with your new purchase, too!