Try blackhatworld.com for that sort of thing, people give up lists like this there frequently.
Expanding on what Sam said - just don't take this approach with an important site or expect to see its reputation trashed.
I'd definitely avoid Black Hat World. You're just going to waste your time with 'SEO' techniques that'll tarnish your reputation and likely line you up for a Google manual review penalty or algorithmic penalty in the future.
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Currently I would stay off all sites with Marketing/SEO services, that contain the word "black" in it
Black Hat marketing methods are a thing of the past and the new Google algorithms are strongly penalizing websites using those. Keyword stuffing, cloaking, irrelevant backlinks, they might have been useful up until recently but will not help you anymore.
As you were advised, put your mind into creating a relevant and unique content and the results will soon follow. I can also recommend to optimize your services for mobile usage as this is a more and more demanding part of the business nowadays. Simply focus on what will be useful for YOU as a user and I am sure your clients would also appreciate that way of thinking
Chances are, any list you find will be heavily spammed, thus if you want to acquire high quality links, you will have to do it manually. Go out and find related high quality sites and comment on them, itís a long process, but its well worth the additional time it takes.
When it comes to blog commenting, one should not expect much from it. There is no point in commenting on any blog just for getting a backlink. Comment only if you have a genuine feedback or opinion about it.
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