Exercise ball 75cm (Bear flat)

Hi all! There’s an increasing number of us who want to use a ball as a chair in our office. They’re not expensive to buy but as a certified BCorp, our ethics and purchasing policy priorities reuse over buying new. So I thought I’d reach out here quickly first before heading to the store to see if anyone has one lurking in a cupboard that needs a new home. It does need to be the 75cm one to be right for a desk height. Many thanks!