Amazon has KOCAWIS Coasters Set of 4 Ceramic Stone Coaster for Drinks Non-Slip Cup Coasters with Cork Backing Absorbent Coasters for Home Library Restaurant Office for £7.99.
50% Off Code is HU2V23A3

Infos:
🌸 SUITABLE SIZE--SUITABLE SIZE--Simple and stylish round coasters design. Each diameter is 10cm（3.9inch）.The size is suitable for most glasses,mugs and bottles.
🌸 ECO-FRIENDLY MATERIALS--This coasters made of safe materials,no pungent smell,healthy and recyclable.Water-absorbing ceramic surface for easy cleaning.Just need simple wipe but don't soak for a long time.
🌸 CORK BACKING DESIGN--You don't have to worry about it scratching the surface of the furniture.The non-slip bottom also prevents your cup from slipping and thus prevents the liquid in the cup from overflowing.
🌸 MULTIPURPOSE COASTERS--Cactus plant style coasters are prefect for home,library,office or restaurant.This cup mat can decorate your home or office and bring freshness to your life.
🌸 CUSTOMER SERVICE AND GIFT IDEA--If you have any questions, plz free feel to contact us. High-quality craftsmanship.It can be used as a gift for people who love life, tea lovers or exquisite people.