Based on this product's specifications, here are some alternatives and similar models
Info-Display Toploader wall-mounted A4 vertical polystyrol holder by Deflecto (model 588401A4EU)
Summary description:
Deflecto Info-Display "Toploader" is a wall-mounted A4 vertical document holder made of polystyrol. Designed for quick insertion from the top, it protects and displays single A4 sheets for notices, instructions or signage in offices, reception areas and public spaces. Supplied as one piece, suitable for visible, easy-access information presentation.