There are many online retailers. I have just finished ordering tile for our new construction and ordered from 3 different dealers mentioned here: Value Direct Flooring, Ceramic Tile 4 U (same as Ppl tile), and Buildirect. Some of the tile I wanted was not available through all dealers, some was available from multiple dealers but one had better pricing, etc. I found all of the dealers that I used to be helpful and efficient in getting the order out. The only problem I had was that Value Direct never processed my sample order. They said it was a glitch with their ordering system because I ordered so many samples.This slowed down my selection process.

Builddirect doesn't sell bullnose or decorative tile, so they aren't really a great source for bathrooms where you may need specialty pieces. On the other hand, I got tons of samples from them, shipped to me free of charge by 2nd day air.

Good luck.

YMMV