carrie
I suspect that once the paralympics start there will be more releases of tickets, like there has been for the Olympics.
I know at the start of the week there were quite a few tickets for all events, if it helps the ticket 'drops' tend to be between 10:30 and 11:30 am, and then between 2 and 4 pm, then anytime from 5pm onwards. It's a pita to keep checking, and it helps to log out then log in again, rather than refresh, so you don't find you have been logged out.
The site seems to release a certain amount of tickets for both games during drops, but oh my word you have to be quick ! And don't get too excited if it goes to 'reserving tickets', with a 2 minute wait, this means nothing !
Then the tickets disappear, only to reappear during the next drop...
Yesterday afternoon there was a big drop of Park tickets, and there were a fair few Excel day passes, depending on what you want...
Hope this helps ?
Good Luck !