The Shenis, a 12″ long golden phallus not meant for use as a sex toy but instead so that women can pee standing up.
The Shenis costs $27.45 USD, including shipping and handling. Alternately, if you are a woman and really, really feel the need to pee standing up, you could always go to your local kitchen supply store and purchase an appropriately sized funnel for about a buck fifty. Admittedly, the funnel will not be shaped like a footlong cock and painted sparkly gold, but it will most certainly let you write your name in the snow with urine.
(I know many a woman has expressed envy over the male ability to do such a thing, which is understandable.)
UPDATE: If you also have too much money, consider the Whizzy, which is like the Shenis, but disposable rather than reusable because it is made of heavy construction paper. Only ten dollars for a pack of ten!
ALSO AN UPDATE: Holy crap, this is an entire industry. The Pee-Zee is a cheap plastic funnel that costs twelve dollars. The Freshette has the advantage of being based off actual medical technology and having relatively ergonomic design, so it costs twenty-two. The Whiz Freedom is eight pounds fifty pence for a custom-designed funnel sort of a thing, and they also have a variant that allows you to collect urine for medical examination purposes. The Urinelle is another biodegradable paper funnel, but it comes in packs of seven rather than ten.
Suddenly, I am scared about the world.