i can provide you a good SEO service including off page and on page optimization only 3$ per hour .
on off page optimization i will provide you a good web 2.0 link wheel which is the best backlink system also i can do social bookmarking ,,wiki submission,Forum Marketing,Directory Submission that will help your website get a good position on google and you will receive a good amount of organic visitor and increase your sale.its depend on your keyword.
on on page optimization Keyword research and keyword selection,competitors analysis , using Google ad word , SEOmoz premium and use another 2-3 best tool,Proper uses of meta and title tags,Uses of Description, Keywords, Robots etc.
also i can do marketing on Facebook twitter , google plus and other social media marketing. if you do that then your website popularity will increase and people who see the add on social media they can be interested to buy your product from your website.