Its a regular winter passtime for us. Once Christmas is over and cleared away, we have a jigsaw table that we set up. We do 1,000 piece puzzles and never the same one twice. This year we have done one which we bought on holiday of a famous heritage site, another which is a map, and now onto our third. We tend to stop in the spring once the weather and the garden tempt us back outside, but we're well into them at the moment.
Charity shops are great places for finding them and I always takes ours there once we've finished.