Im not 100% sure I understand what you really need, but you could get the HTML source directly in the browser.
If you are using firefox you can do a lot of fancy stuff right in the browser.
- Right click in the page -> View Page Source (Alternative would be to press ALT and search for source in the HDU)
- Hightlight the part of the page you want the source for -> Right Click -> View Selection Source
If this is not enough, you got a lot of addons for firefox that lets you fool around with the HTML =)
If this is a high volume job, you might need some script to get the job done however (download, use perl or something that supports regular expression to search, extract).
But if you just need to do it once in a while, the firefox methods might be enough?
Did I understand the question correctly?