ThermaCELL Mega Refill Packs (R-10): 60 Mats and 20 Butane Cartridges (2 Pack) - Walmart.com
Amazon.com: Thermacell Mosquito Repellent Refills; Compatible with Any Fuel-Powered Thermacell Repeller; Highly Effective, Long Lasting, No Spray, No Scent, No Mess; 15 Foot Zone of Mosquito Protection : Health & Household