I won't ask how much you want to pay, but they come up for between £50 and £80 fairly regularly. You occasionally see them for £40 but not too often. I paid £200 for my flight of 4 which I guess was middling but I was happy at the time. I would go for Angram if you can as they are very serviceable and you can still get parts for them.
There's a nice looking Lees one on for £70 in Manchester