I paid £25 for mine, after haggling over a flea bite on the pontil. If you follow my link to the whitefriars site, you'll find a discussion about the price. Seems it varies hugely.
I once sold a whitefriars elephant's foot on ebay and think I got about ten or twelve pounds for it, my son sold one recently and his fetched under £3.50. Luck of the draw I guess. Hope you enjoy it, it's one of my favourite pieces too.
Tina