I just created a Joomla module to do a Domain Avail check. It does an AJAX call using WHMCS API and either returns Unavailable or Available with a link to add to your cart.
It has an option to use jQuery or MooTools javascript engine, selectable in the joomla module settings.
You can see a demo of it here in the side bar:
http://doory.com/domain-names
Let me know if anyone is interested in something like this.

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