These have been in stock at Salt Lake City area Costco warehouses, not sure what stores will carry them, but these can be ordered online.
Goal Zero Yeti 1000
Lithium Portable Power Station
Item Description www.goalzero.com/costco [goalzero.com]
These are half the weight of the lead acid power stations. Costco may be the only store selling the Yeti 1000 Lithium as I haven't seen it available anywhere else. The Yeti 1400 Lithium sells for $1999.99 on the Goal Zero website. For the same price you can literally buy 2 of the Yeti 1000 Lithium power stations and chain them for the same price. If you are looking for a Goal Zero solution, this Yeti 1000 offers light weight and exceptional pricing compared to their other products. Purchase with your Costco Citi card to automatically double your warranty for free.