URL filtering licensing

Hi. Please see these questions regarding url-filtering on TMG.

Is URL filtering a licensed product that is part of web protection services? I have seen differing answers, but the post on the ISA Blog seems to indicate so: http://blogs.technet.com/b/isablog/archive/2010/02/02/forefront-tmg-2010-web-protection-services-licensing.aspx

How does a small business with a handful of users purchase the url-filtering license if they do not have an EA? They are not interested in purchasing the malware protection, but just the url-filtering.

Also, if they do not want to spend any extra money, can I simply configure url-filtering via excluded domains, the way it was recommended with ISA 2006 and ISA 2004?

Will url-filtering be unavailable if the license expires, or will it just not be updated regularly?

Thanks.