Based on this product's specifications, here are some alternatives and similar models
Plant pot insert FORM_PLASTIC Standy2 D29cm, white
Summary description:
FORM_PLASTIC Standy2 plant pot insert, made of durable white plastic with a 29 cm diameter. Designed as an inner liner for Standy2 pot stands, it is easy to clean and suitable for indoor and outdoor use, helping to retain soil and water while protecting the outer pot or stand.