Any cubes that we can not buy in bulk from the manufacturers would not be feasible for us to sell. Cubes from Mefferts are usually only available from Mefferts.
For example: Us buying puzzles from Mefferts, and then selling them from you would not be plausible, as our prices would have to be higher than the retail price for us to profit at all.
So, if you want cubes that are sold and produced by the same company, such as Mefferts or V-Cubes, you may as well buy them at the official website. There is no way for anyone to buy those cubes any cheaper than anyone else can, so they can't sell them for any less.
That was REALLY long and drawn out, but I hope it helps you understand why we will not be getting puzzles such as V-Cubes or Mefferts. (For now at least.) If somehow we can buy them in bulk for a lower price, that may change, but for now, we will not be selling them.