1. ThemeForest (themeforest.net): ThemeForest is one of the largest marketplaces for themes and plugins. It offers a wide range of products from various developers, and you can often find discounted items or special promotions.
  2. Mojo Marketplace (mojomarketplace.com): Mojo Marketplace offers a selection of themes, plugins, and other digital products. They frequently have deals and bundles available, which could help you find affordable options.
  3. TemplateMonster (templatemonster.com): TemplateMonster is another popular marketplace that offers themes, templates, and plugins. They often have sales and discounts on their products, allowing you to find more affordable options.
  4. Creative Market (creativemarket.com): Creative Market is a platform where independent creators sell their digital products, including themes and plugins. It’s worth checking out their website for discounted items and special promotions.
  5. WordPress.org (wordpress.org/plugins): If you’re specifically looking for WordPress plugins, you can visit the official WordPress plugin directory. While most plugins listed there are free, there are also premium plugins available at varying prices.

Remember to exercise caution when purchasing themes and plugins from any website. Verify the reputation and credibility of the seller, read reviews from other users, and ensure the products are compatible with your platform and meet your specific needs.