What sight would i go to, to look up how much an old antique electric iron made in england is worth?

Question:i have an old as hell antique electric iron that was made in england, with 3 different plug in fittings for different countries i believe and it also has one that plugs up to a light bulb socket. They all fit into this cloth like cord that hooks up to the iron.
Any info wwill help!

Answers:
I go to Kovels.com ; tias.com and ebay and do a search for the item I want to price.