Based on this product's specifications, here are some alternatives and similar models
Stability base for Mast Stand by Compulocks — model STB3W, white, compatible with Compulocks Mast Stand 333B/333W
Summary description:
Compulocks Stability Base (model STB3W) is a white replacement/stabilising base designed for use with the Compulocks Mast Stand models 333B and 333W. Supplied as a single piece, it provides additional support and stability for the mast stand setup. Ideal for retail displays, kiosks and public spaces where a secure stand base is required.