If you were beta testing, then you had your own resources made available to you by Apple. You had an opportunity to update to the latest build. More importantly, you agreed to an NDA, which means you are not to discuss any aspect of this anywhere other than within the testing area (that includes these forums and the Apple store).
The Apple store will not be able to help you. You will not be able to update now since the latest build was released publicly (therefore the testing is closed). The only way out would be to go back to an older (public) release of 10.7.0 or 10.7.1 and then have Software Update update it to 10.7.2. You did keep your older installer(s), didn't you? So, if you have a backup, go back to an older version and update it, then port back your files. Or, you can simply stay with the - now unsupported - beta version.
By the way, how did you get Lion originally? Did you pay for it at the app store or was it furnished to you free of charge? If you paid for it, you should be able to download it again; if not, I believe you're out of luck, but I may be mistaken.