they don't seem to have a free trail, but they're only $39/mo. Wonder if you can get it for a month and then check the source code to find the answer to your question? If you think it's cheaper elsewhere, maybe the $40 can be recovered quickly.
Just a thought. (and if you find the answer, I'd love to know too!)
New advertising option:
A review of your product or service posted by a Sterling Sky employee. This will also be shared on the Sterling Sky & LSF Twitter accounts, our Facebook group, LinkedIn, and both newsletters.