Wrong  and Wrong.... he he he

Cheapest is a Tx3 box (1GB+8GB) at RM88. See my earlier posting below. [Click Here RM88 ONLY]

And the seller I mentioned is not selling Tanix brand of Tx3, but OEM Tx3, or what the industry calls as OTT boxes.
However, unlike others who only provides 3 months or 6 months warranty period, this seller's product has 1 year warranty and every box comes with serial number label.

A way to differentiate Tanix Tx3 and Tx3, is the word Tanix on the box.

Tanix has their own Home Launcher page design they called Alice UI. It is just a fancy lean back launcher like Nova Launcher etc...
Tx3 has a more traditional home launcher, but more importantly it has a "Pull down status bar", and "Pull up navigation bar" if a mouse or airmouse or wireless keyboard with touchpad is used.

From my understanding, Tx3 can be flash with other ROMS, including Tanix Alice UI or Android TV experience ROM. As posted earlier, I too agree all the hardware design of Tx3 is the same only difference is the ROM and kernel different manufacturer install into the box.

Don't think there is any Intellectual Property Rights to this Tx3 boxes and definitely not enforced in China. So no reason to reinvent the wheel, might as well just copy the hardware blueprint and mass manufacture from different manufacturer. That is when quality of the electronic components come to question.
If the box sellers cannot differentiate AAA grade boxes from lower grade boxes, the eventual losers will be overseas buyers. That is why it is critical to buy these from Specialist Box sellers be it local or overseas.  Don't always go for the cheapest of the cheapest, always check the previous customers comments and seller product history.