Varieties of silica gel packets offered by Wal-Mart include Lockdown Moisture Absorbing Silica Gel and Rhino Safes Silica Gel Dehumidifier Desiccant Packs, as of 2015. Wal-Mart also sells silica gel crystals in varying sizes and price ranges.
Lockdown Moisture Absorbing Silica Gel packets come in 450-gram packs and retail for just under $20. Rhino Safes Silica Gel Dehumidifier Desiccant Packs, also available in 450-gram packages, retails for approximately $45.
Silica gel is a form of silicon dioxide with properties that make it exceptional for readily absorbing water. It is typically available in beaded or granular form and often used as a drying agent to control humidity and prevent spoilage of goods.