Storyteller.net offers a free web page, but the paid version is even better, and a bargain. Although you can't customize the page, it is very Google friendly (as opposed to NSN's directory, which will cost you more and is not accessible by Google).
Here's a tip: wherever you end up putting your page, make sure you include your hometown and a sprinkling of other cities you have performed in. That way, you'll show up when someone who doesn't know you by name Googles "Brownsville storyteller."