Does anybody know of a reputable advertising company that provides free trial advertising and has guaranteed results? Thanks in advance.
I don't think you can get "guaranteed result". You better use pay by sales ads coz you only pay commission if your product is sold.
Try advertising on facebook. It is an effective way to reach your exact audience and connect real customers.
Google Adwords Man! Look for one of their Free ad codes for like $50 bucks to start you out, create some campaigns, do your keyword research properly and I am pretty sure you will get some results. Good luck!