Amazon has the Home-it Adjustable Bed Risers or Furniture Riser – 4 Pcs in $7.73 with free shipping for Amazon Prime or orders over $25.
Product Features:
- Polypropylene.
- Customize to your own needs: Extra 8″ High Extra 5″ High or Extra 3″ High, the opening is 3″ X 3″ X 3/4″ deep.