Before, Lulu.com had one format that fit the Sorcerer novels. It was a "US Trade" size of 6"x9" with very nice paper and a glossy, full-cover cover.
Lulu has just introduced their "Publisher" editions which are slightly smaller (5.5"x8.5") with different paper. I've set the Sorcerer novels up in the new "Publisher Digest" size and am checking it out. So far, the price is about 22% to 25% lower than the Trade edition.
There are always tradeoffs; I'll let you know what I think of the new format