I came across Seoclerks last month. This website offers all kind of SEO services. And it's much cheaper than fiver! Prices start from $1. You can buy or sell your own services.
Amount of things you can buy on this website is just amazing. Youtubers can buy milions of views, subscribers, likes, rank yt vids, twitter fans can buy retweets, likes, followers. Website owners can buy backlinks, translations, reviews and so on.
You can hire freelancers to translate your articles to almost every language. If you own a blog, website you can sell backlinks for example.
Seoclerks is very useful for me - i'm blogging on tumblr and found many gigs related to tumblr, which helped me to increase followers: