check this site : http://www.internationallilacsociety.org/retailers.html

i got all my questions answered from only one source : mascouche, quebec, good luck

mariodenis, an interesting site, but I couldn't find anything that described specific cultivars, which is what I need. That or a recommendation.

Google non suckering lilac cultivars and the site "NGC -Lilacs for the Prairies" will give you a listing of the Father Fiala's and a lot more. Can't recommend any of them since my 100' plus hedge is comprised of the old common lilacs which were planted @1900. These, of course, sucker, but it makes the hedge extremely dense. This was a good year for lilacs, the blooming was spectacular.