I got great Organ brand needles at a great price from the yahoo group called needlecoop. You do have to buy in bulk, which is why they can get great prices. If you can't use all the needles yourself, go together with friends to split the order and the cost.
I understand that lots of brand new sewing machines come with Organ brand needles already in the machine, including Janome.
needlecoop has all kind to choose from including Titanium. Check around for prices and then check them at needlecoop I think you'll be surprised.