Advertising for fresh garden

Advertising company on Facebook on goods for the wheat garden and garden. In July, the sale of the goods was not up to date, so the display of the ads was stopped.
The customer set the goal to make from 500 sales of his goods to the end of the season with the price of the lead not more than $5.
Lending initially gave a conversion of 1 to 100.
The site was analyzed, all the CA, their interests and objections, after which the site was twisted, and more precisely from zero the mobile landing was written on which the advertising was carried out. Conversion after changes on the site and the correct setting of the RK was 1 to 30, the price of the leads was $2.66