Walmart has a great Blue Rhino Propane deal advertised in the weekly sales flyer. Purchase a new tank for $46.82 and get a $25 gift card, or exchange a tank for $18.92 and get a $10 gift card. To make this deal even better, there is a $3 off printable coupon (using zip 73019) good with or without a tank exchange, bringing the total cost to as little as $5.92 per tank (after gift card and coupon)!!
Plus you can also redeem for a $3 Mail in Rebate found here.