Found this refurbished Hisense Sero 8 for $77 on Groupon, whose specs seem pretty similar to the Fire HD 6. Hisense Sero 8 16GB 8" Tablet with Android OS and WiFi | Groupon. Hisense made a name for itself with the Sero 7 Pro, so the Sero 8 might be worth looking at.
I'm not sure you'll find a Google-sanctioned device (meaning it will have Google services on it) at that price point. Amazon can sell theirs at such a low price because they anticipate the Amazon Prime subscription fees will more than cover the "loss" they may sell the device at. To get FULL use of all the features (Amazon streaming services) you need a Prime account.
Have you considered rooting a kindle? For $99, the Kindle Fire HD 6 seems like a contender for such a thing.
Otherwise, I was looking for something similar and am thinking of purchasing a HP Stream 7 just because Microsoft has such a great deal running right now. ($79 + 1 year Office, 100 skype minutes and $25 Store credit)