I made a point of going into the Yankee Candle shop in my home town Worthing today - they had wax tarts in all fragrances.
I know not why - but for some reason my Town hosts the only UK Yankee store - I remember (whilst working in the a grade Centre industry) asking the Uk Sales Manager about the Worthing shop and he could not explain why it is unique and alone.
It is a big shop - but their wax tarts are £1.49 each (definitely more than US prices)
If you are ever stuck for a particular fragrance I can check in their shop!