the Bowery shows will be sold through ticketmaster. bowery no longer uses ticketweb. I believe you need a U.S./Canada address for ticketmaster as a friend of mine who lived here had his Netherlands address for his Credit Card and he couldnt buy concert tix online.
The last bigger band i saw at one of their smaller venues sold out in less than 5 mins. Id suspect that the webster hall and bowery ballroom will sell out that quickly. I know there are more Morrissey fans here than of Montreal fans (or at least id assume).
i did finally get an email from the bowery websites announcing the morrissey dates, so they are confirmed (just not yet posted on the website, last i checked). i havent yet received/heard anything from Carnegie.