Hi,
Here is a link to just one supplier of the charger. It is not a recommendation to use them. It is only shown to give an idea of how much it costs.
There are other suppliers online. Just search for'' NX700QC charger'', look for results that specify a 2A charger and select the one that suits you best.
http://www.ebay.com/itm/2A-AC-Adapter-Wall-Charger-DC-Power-Supply-Cord-for-Nextbook-7-NX700QC16G-Tablet-/131743804012.