Get number of child pages with a custom attribute value

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I have a thumbnail page list template. In it, I echo the number of child pages (2 levels down from the page the page list is on). I need to filter those child pages by whether they have a custom attribute select list value.

Is there anything like $cobj->getNumChildren('custom_attribute_handle', 'attribute_value')

???

The thumbnail page list is showing neighborhood pages, each neighborhood page has child pages that are homes for sale in that neighborhood. Right now, I am listing the total number of homes in that neighborhood, but I need to list a number for homes with the custom select list attribute set to "Available".

Thanks in advance for any ideas!

tduncandesign