There is a seller on Ebay that is selling the large jar Yankee Candles for either £14.99 or £15.99. If you buy one, you can elect to have it sent to Argos to pick up, at no extra charge. So basically no postage.
She has loads to choose from 289 today including the Christmas candles.
This is her link
http://myworld.ebay.co.uk/heavenlyscentsscotland/