Quality LinkBuilding Needed

NO FORUMS, NO BLOGSPOT, NO DISQUS.

-comment on indexed page
-"dofollow" link
-less than 20 external links on page
-1 comment = 1 domain
-no subdomains
-relevant and unique comment text
-education or similar thematics

Looking for homepage links (do-follow).

Requirements for the sites:
100+ SE traffic ;
100+ ref domains ;
I'd prefer educational platforms (college, writing tips, guides for students, etc.) but any platform is OK(except gambling, pharmaceuticals, pornography, etc.)

Please send examples of domains with prices.
Links must be DO FOLLOW