No trial, just launched it and immediately after that (with the first launch wizard still on screen) I went to the menu: 1Password > buy...I downloaded it from their website as well. Did you do the trial mode?
The trial they are offering is for their cloud account so it makes sense to allow you to only renew that kind of account. Not many people would stop the trial and then buy the other option.Maybe the option will turn up AFTER the trial ends? Right now, I do not see it as an option. I did try signing out and back in.
I think your only option here is to completely uninstall 1Password with something like the free AppCleaner and then simply re-download and install it again but this time do what I did and go to the menu after you launched it. Or you could indeed purchase it from the Mac App Store.
@itguy06: yeah, I think Agilebits needs to be very careful of Enpass, it seems to be their main competitor which does everything they are now stopping.