Keep in mind that a lot of precuts are labeled with terms that are specific to the brand. For instance, what Moda calls "jelly rolls" is the same as Timeless Treasure's "tonga treats". The Moda site listed above is a good one to use - as long as you're using Moda precuts.
When you purchase precuts, somewhere in the listing or on the package it should say what size the fabrics are cut and - this is important also - how many pieces are included. I'll never forget the time I thought I'd found a great deal on a jelly roll only to realize after I received it that it only had 20 strips, instead of 40.
