UPDATED! See here.
For those who don’t know, Nikon doesn’t make battery grips for its lower-end DSLRs. The advantage to this? The pricetag is a lot lower on a third-party grip. The problem? Well, there are a few issues one wouldn’t expect with an official product from Nikon.
I got my “professional vertical battery grip” through Amazon here. There are a handful of different sellers, and I can’t vouch for any of them besides New Harbor (though at that time, the shipment was fulfilled through Amazon when I ordered). I bought mine for around $25. Interestingly enough, while it was advertised as being made by Neewer, the packaging and product itself is labeled Meike.