Samsung Case for NX300 (pics)
Got this from Best Buy Online, but other retailers have them. $31.24 seems a good price, given the quality of the materials and the fit (excellent). No battery pass through would be my only complaint. Has a hole for the side speaker and doesn't block the USB hatch.
There's some limiting of the back tilting movement, but only a bit. Overall, if you can't afford Gariz I'd say this looks to be the best choice. Don't bother with the ill-fitting $12 Chinese Amazon/eBay half cases - not worth it (as I found out).