Chico, Demosphere costs $150 / month. There are additional charges that are incurred when members use a credit card to register online, but the added service is worth the (relatively small) cost.
Carolina FC used Blue Sombrero for one year, and whilst it did not work out for us, I believe they are on the right track. (CFC was one of their first clients, and we basically proved to be a testing ground for them!)
