Cost of Running in a Race

The registration for the 2014 Nike Women's DC Half Marathon opens today! Or rather, the random drawing opens today and closes on November 22nd.  The cost is a shock-inducing $175.  The race was nice but the course isn't all that unique (very similar to Cherry Blossom 10 miler.)  However, the registration sticker shock is hard to get over. I have until the 22nd to decide if I want to plop serious $$ for this race.

What is the most you've ever had to pay for run?