Standing mat
$110.00Price
Do NOT make the mistake of thinking these are like the standing mats you find at your local big box hardware retailer ( Mitre 10 or Bunnings). These are specifically designed for the purpose. They sit flat (no edge curling) and are incredibly hard wearing and slip resistant.
Spend the extra $$ and get something your feet will thank you for.
Check out some exercises you can do standing at your desk.