I just took home some samples from Seneca Tile. The colors look a lot better than their website shows. The tile guy thought they ran around $20 SF which is still high IMO but better than others. Neither of us had time for him to look up prices so I am not sure on that price. They have a lot of sizes to choose from which is also nice.

North Prairie Tileworks is another option - I think they are around $30 sf.

You might want to look at the Rixi tiles by Ceramiche Grazia. I think they're under $10/sf, and have a really pretty varied glazing. They have a variety of really soft pretty colors, some with a crackle glaze, some without, and various shapes.

Here's a link below to an online source. I think they were cheaper at my local tile store though.

Here is a link that might be useful: Rixi tile

Thanks for the help! The rixi looks like a great option!