I find WOF at local quilt shops as well as JoAnn's. I was in Shipshewana this morning visitig the two major shops in town, Lolly's and Yoder's, both had bolts on sale from 10% to 50% off the original cost of the fabric. But I find it in local shops in my home town all the time at 20-30% off original price. I just purchased a bolt of WoW from Fort Worth Fabric Studio for about $6.00 per yard online. I have also see it from MSQ in their three yard cut sales.
(Shhhh don't tell any one but I peruse the the give away table at my quilt group meetings for odd small cuts of WoW and I take any thing from odd jelly roll strips to weird pieces from someones project left-overs. If it is at least 2.5", I will allow it to jump into my take home bag and put it to use. You may have noticed that I like using WoW in my scrappy quilts to just set off the colors of my other scraps.)