I just received some fabric from Craftsy today. It was not a kit, but a pack of single yard cuts (tossed ring batiks, beautiful!). Many were exactly a yard to the thread (how do they do that! ;-)), but a few were a little short, like a quarter inch. One was ~3/4 inch short. None was over. I wrote them and am hoping to benefit from their customer service which I'm told is great. However, I may just be returning the fabrics. I also ordered a kit, which I'll very possibly or likely return unopened. I don't want to be shorted on a kit.
So buyer beware. Any of the stores can short you.
If a little bit of shorting didn't matter, certain stores wouldn't short people. And if it was just human error, some pieces would be over. Somehow the "mistake" tends to typically favor the store.
Side topic: Fabric.com doesn't do 37" anymore, at least not for me. I'd love a list of shops that cut a tinch extra, but won't hi-jack this thread for that.
Anyway.... ;-).