Looking to buy a morphie juice pack for an iPhone 6+

Working here in Thailand for a few more days but my phone keeps dying during early in the evening. Must be the 4g. So looking for this

http://www.mophie.com/shop/iphone-6-plus/juice-pack-iphone-6-plus?=88

But all the shops I've been are sold out of the 6+. Any help is much appreciated.