The fine folks at K&J are a boon to hobbyists. They have in stock every kind of magnet imaginable in every size. I use their magnets in my table top war game miniatures and have been very impressed. The pages are easy to read, the sizing charts are excellent and the explanations of polarity useful. I usually get my order within days instead of weeks and have been extremely pleased with their service overall.
They get two bolters up :)