Gymshark is a very successful ecommerce store that specializes in fitness apparel. It's not possible to give an exact estimate for how much it would cost to create a Shopify store similar to Gymshark without knowing more about the specific features and design that would be required. However, in general, it would likely cost several thousand dollars to design and develop a custom Shopify store that has the same level of functionality and design as Gymshark. If you're looking to create a similar store on a budget, you could start with a pre-made Shopify theme that has many of the same features as Gymshark, and then customize it to suit your needs. This would likely cost a few hundred dollars, depending on the theme you choose and the extent of the customization.