Thank you for the responses.
The Axis device doesn't appear to be workable as I read the manual and didn't see any support for dynamic dns.
The ak357 was confusing-- saw the camera demo but a google search didn't reveal anything about the company, how to contact or order, pricing, etc.
And, the xnet looks interesting and does support dynamic dns. But, like the above, a google search didn't reveal any way to purchase or learn pricing.
Does anyone know how to get more info on the xnet video server, or, are there any other single camera alternatives that would support dynamic dns? I don't have a dvr at the location to be monitored ...