I don't know of any lotto site that makes that info available (maybe someone else does?) but that is one of the main reasons I don't play scratchies.
Let's say someone buys the big winner(s) on the first day of issue, then for the rest of the time period (be it days or even weeks) the only remaining prizes available are the secondary ones. It's in the issuer's interest NOT to divulge that info, because why would anyone buy a ticket knowing the top prize is already gone?
Some lotto corps. don't pull the tickets from the stores until 95% of them are sold ... or their pre-determined (shelf) time is up. Here in BC they don't post the info you ask about in stores, nor on their ws, not that I have noticed ... maybe other provinces do?
With lottos which have a draw date/time there's a chance to win the JP everytime one buys at least 1 ticket ... how ever small chance it may be.