It is kind of annoying that there's a two tier market: as a consumer, you can buy all sorts of extremely cheap nifty boards to connect to the Arduino, by having them posted from China to circumvent all the rules. But you can't circumvent the rules yourself.

(Well, you can, the enforcement is pretty adhoc, but there is still a nonzero chance of getting spotted and fined and they can actually collect against you in the EU)