URBNFit Exercise Ball 55cm $11.18 (Retail $20) The links in the post below may be affiliate links. Read the Full DisclosureJanuary 27, 2022 by Kim Julian Get this URBNFit Exercise Ball 55cm for $11.18 (Retail $20). Available in blue or black at this super low price! Get free shipping on a $25 order or free 2-day shipping on any size order with Amazon Prime.