Its really depends on the country tax laws and some luck :)
Personally, i would always recommend getting the original DuetWifi. as I said before, the current clones will work exactly
the same but there is a really big "rights" issue with some of the manufactures that not putting the needed credit.
Since there were so many requests and discussions about one place to get most of the parts, right now this is the only available option. BTW, I'm myself about to pull the trigger on the Hiwin rail set from this store..