The Valk 3 can be bought from Cubezz for $14.35 and from Lightake for $12.99 + $1.48 shipping.
The shipping from Cubezz takes usually ~3weeks to germany. My last order from Lightake took 6 weeks to arrive.
You might want to check out this unboxing or this (p)review.
Also you might want to consider to open a paypal account and order the cubes directly from china. The MF3RS2 is $5.55, shipping included and MF3RS is only $3.65 on cubezz.
I pretty sure nobody would "clone" these cubes. Instead of a clone a seller could send you a different cube, either by mistake or on purpose.
Feel free to compare the internals of the 2 cubes with images from the GAN357 and ZhanChi for yourself.
Right, that "bubbly" feeling is a characteristic...
If you have the time and want to save some money, check the import regulations for your country to see if it's worth to order from china.
Prices when delivered to germany:
4xQiyi Thunderclap V1 for $4.6/piece from Zcube(discount code zcube)
4xQiyi Warrior $2.53/piece from Zcube(discount code...