As of this posting Target has 20 lb bags of Pit Boss Competition Pellets for $5.99. Order online and pickup in store to skip shipping costs or put together a $35 order and shipping is free to many US addresses.
Note: From what I’ve gathered, availability of this has been touch and go. It’s apparently going in and out of stock. As of this post, it’s in stock, but check the product page for current availablity.
Price, promotions and availability can change quickly. Check the product page for current price, description and availability.