by post:
Toronto
  Suite #1734 - 225 The East Mall
  Toronto, Ontario
  M9B 0A9
  ph: (416) 525-9332
Montreal
  Unit #3 - 5145 Cote St Luc Rd
  Montréal, Québec
  H3W 2H5
  ph: (514) 660-1756
by email: sales@gbseng.com