Acrylic glass, also known as plexiglass or acrylic sheet, can be cheaper than traditional glass in many cases. The cost of acrylic glass can vary depending on factors such as thickness, size, and quality. However, in general, acrylic glass is less expensive than glass.

One reason for this is that acrylic glass is easier to manufacture and shape than traditional glass, which can be brittle and prone to cracking. Acrylic glass is also lighter than glass, making it easier to transport and handle.

In addition, acrylic glass is more impact-resistant than glass, making it a popular choice for applications where safety is a concern, such as in windows, skylights, and safety shields.

Overall, if cost is a factor and you are looking for a durable and lightweight material, acrylic glass may be a more cost-effective option than traditional glass. However, if optical clarity and scratch resistance are important factors, then traditional glass may be a better choice.