Hi El Tío.. prices are definitely much cheaper in Spain than in the US. But, there isn't much difference in price between buying your pieces in Valencia or any other Spanish city.
However, if you go to Tavernes Blanques, the town where the actual Lladró factory is (just outside of Valencia city), there is a small factory outlet store/museum where they sell slightly imperfect Lladró pieces for almost 50% off the retail price. I have bought all the pieces for my mother at that store. In most cases, the imperfections are scarcely noticeable.
I just pulled the address from the Lladro website.
Carretera de Alboraya s/n
Tavernes Blanques (Valencia)
Telf: 96 318 7008
There are buses that go there which leave from the Plaza de Ayuntamiento in Valencia City.