OrganicBTI on eBay sells Gnatrol WP at 100% mark up from bulk. Relatively quick shipping. I have to double check but I believe there is a discrepency between Gnatrol recommended dose and what is printed on the ziploc.
Doing a test order for Kontos, I'll update in a few weeks.
For BTI Vecotbac from a agri wholsaler or Gnatmax from MicroMaxx in Kelowna.