Apparently Barbra's Detroit concert didn't sell well (go figure!), so another date has just been added to Toronto's share. If you want to check for tickets, be aware that numerous counterfeits are out there already, so your best bet is to go right to Ticketmaster.
Out of my price range. The closest I ever got to a Streisand concert was in Melbourne, Australia, in 1998. Her concert venue was in a stadium near the train station, where I was waiting to board an overnight train to Sydney. Good times!