You can also purchase this insert from Ebay and then order the PB Anywhere Chair replacement cover. I'm not sure how it compares to the Uglychair but it's way cheaper than the PB Anywhere Chairs! :) Here's the link to the ebay insert.
http://www.ebay.com/itm/200843606290?ssPageName=STRK%3AMEWNX%3AIT&_trksid=p3984.m1439.l2649