Not an answer to the question per se, but I've picked up a few (in case one or more packs up) USB power adapters on eBay for $1.50-2. All work just fine, none have packed up so far and all are 5V/1A and charge my 950 in no time at all.
Below are a few links to the models I've bought. All are EU models, but the same devices with US plugs are easy to find.
http://www.ebay.com/itm/USB-Power-Ad...item27bcc33312
http://www.ebay.com/itm/EU-USB-Power...item3cc0aefc5f
http://www.ebay.com/itm/EU-AC-USB-Po...item19cd4cd1af