List/Recommendations of 8 inch eReaders

I'm on a large screen eReader kick right now, and I find myself especially fond of the ones with the 8 inch screens; they're a significant difference from the 6 inch ones, but they're more portable than the 9 inch and up eReaders. I was wondering if there was a resource out there that detailed known 8 inch eReaders, and where to buy them - or failing that, if people could recommend specific eReaders they know of that fit my specifications. The ones that I already own are the Kindle Fire HD 8, iRex DR800, iRex Illiad, Icarus Illumina XL, and Onyx Boox i86. I would appreciate any recommendations for others that are out there. I'm willing to buy new and used/refurbished. I live in America, so anything that ships to the US, or I can buy from somewhere like eBay or Amazon is preferable. My budget is under $300, although I might be able to budge a little on that, depending.

Thanks. :)