Lilacs in bouquet

I was just wondering if this is done and what the cost of lilacs usually run about. I am getting married next June 13 and would like to have a bouquet that would include purple lilacs and pale pink roses. Probably some in my bridesmaids bouquets as well. Are they difficult to incorporate or do they wilt very easily? And are they still in season at this time? I know the prime is a little earlier but I was wondering how far off June is.
Thanks!