You have extracted some of the great Gigs of fiverr. Although backlink Gig sells more than anything other. But I really doubt if Scrapebox blast really helps your website. Instead I will prefer manual comments.
http://fiverr.com/curomind/do-guest-post-on-7-tech-blogs-with-one-backlink-from-each-blog This guy writes 7 posts on 7 different technology blogs (3x PR2 + 3x PR1 + 1 PR0) with a backlink to your site. The articles have always been extremely relevant and the links are in the article itself and not in the author's bio. He has helped me rank quite a few of my articles. The only thing I don't like is that he is always late with his orders.