The worlds fastest SD cards from Sandisk are now available for preorder at BHphoto (Click here). You can grab the 16GB, 32GB and 64GB versions. A good companion for your GH4!
And that deal runs for 24 hours only: $200 off on the Rokinon 16mm f/2.0 MFT lens at [shoplink 44890 ebay]eBay US (Click here)[/shoplink].
All current Olympus deals can be seen at GetOlympus (Click here).