Here's the dues structure for IT Alliance - looks like they offer:
$4,000 enrollment
$750 annual renewal
Commit to send at least one firm member to both the Spring ITA Members Meeting and the Fall Collaborative (2 attendees are highly recommended).
Participate in all benchmarking surveys and best practices studies conducted by the ITA.
Sign the ITA Code of Professional Conduct.
Maintain your membership qualifications, including timely payment of invoices.
https://www.italliance.com/eweb/DynamicPage.aspx?Site=ITA&WebCode=CR