I am a professional on line marketer and ad poster . Please let me know how many ads per day do you want me to post on classified site? How many cities do you want me to post in Canada and USA? You will receive a list live URLs at the end of day as a proof of posting . I do not charge $$ for ghosted or deleted ads. My rate per live ad is very competitive .
You can try computer , creative and small biz sections in the most popular classified site , Craigslist , to promote your business.