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You can buy water-absorbing polymer crystals from various sources, including:

Gardening Supply Stores: Many gardening supply stores, both online and brick-and-mortar, carry water-absorbing polymer crystals as they are commonly used in gardening and landscaping.

Home Improvement Stores: Stores like Home Depot, Lowe’s, or Ace Hardware often have a gardening section where you can find water-absorbing polymer crystals.
Online Retailers: Websites like Amazon, eBay, and specialized gardening websites offer a wide range of water-absorbing polymer crystals in different quantities and brands.

Nurseries and Garden Centers: Local nurseries and garden centers may also stock water-absorbing polymer crystals, especially during gardening seasons.
Farm Supply Stores: Some farm supply stores or agricultural supply companies may carry water-absorbing polymer crystals, particularly for use in large-scale agriculture or landscaping projects.

Before purchasing, make sure to check the product specifications, reviews, and application guidelines to ensure you get the right type and quantity of water-absorbing polymer crystals for your needs.