rocknbil - 6:42 pm on Jul 13, 2010 (gmt 0)
As I recall, Authorize.net and Netbilling both support free trial period subscriptions, and both allow you to enable or disable AVS; verified by Visa optional. Which is really the only anti-fraud you should disable. You can optionally disable CVC, but bad idea.
Both, however, require a bit of robust programming to set up correctly.