Our internet website  www.thctestkits.com/ gives us 95% of our business, we go to product shows but pass out cards to everyone.  We  do  not pay for a booth at this  time. We go to  places that sell similar items and ask  them  to let us put our business  cards in their store ( we provide cards and card  holders), most have no problem with that. We offer discounts all the time to keep clients coming back to look at  our website, and we have a  face book store which gives us  exposure but not a lot  of sales. We are VERY customer service based and that  gets  us  return  business.