I purchased one from NewTrent.com, they make a wide array of portable batter changers and crApple accessories. While the tip is not thin, it is firm and very easy to use. The best part is the tip is retractable and not that spongy crap that is used on so many stylus. The weight seems just right, a little lighter than a good pen but heavier than a bic ballpoint. Here is a link.
ipad 2 stylus pen, iphone stylus pen, phone stylus | NewTrent.com
They had a coupon on their facebook page that reduced the price to free + s/h, which was 2.95 for me.