Yankee Candle has a Buy One Get One Free promotion on their Large Jar Candles & Tumblers when you enter code XF010A3 in the promo code box in your shopping cart. The large candles end up being 2 for $25 after discount. Shipping is a flat-rate $5 for your entire order up to $100, and free for $100+ orders.
If you prefer to shop in store, there is also a Printable Coupon for the same discount (see below to print)
Large Jar Candles
Large Tumbler Candles