B&M normally do these really dirt cheap in January but if you need them before then this should be a good enough deal if you need some. They had multi coloured as well for this price. These can be used indoor and outdoor. mains powered. I think the 200 LED ones were marked down to £9.99.
I found these in the Doncaster town centre branch as you walk in on the shelves to the left where they normally have their weekly/monthly "special" buys. There were loads on the shelve.