I tend to get mine from ebay - so cheap that even if they fail I don't mind.

I got mine from B&Q about four years ago and they are excellent. A bit pricey if I remember but worth it. Try to get them with double lights (makes them brighter) and a winter setting if you can.

I have bought many, over the years, and find that price has nothing to do with it!I have also tried taking them inside over the Winter, and leaving them outside all Winter [no difference.] They just dont last! So I now buy as cheaply as possible, usually the coloured ones from Argos [that you can also change to just white light by flicking a switch.]They are pretty and cheap enough to buy a pack of 6 every year.The last lot have already lasted for 2 years, but that's pushing it.