Outsourcing or Custom built bots are the way to go. Use ZennoPoster or uBot.
Here is a free alternative:
The Automator
If You choose outsourcing then I recommend oDesk. Use fixed-price jobs at first. But always check their ratings, and samples, plus ask some questions from them in the interview.
The other option would be Fiverr of course. Especially if You are on a low budget. There is a nice thread about the best Fiverr gigs. Read it for some recommendations.
Hope this helps!
http://fiverr.com/users/chasegreen/gigs/create-a-link-pyramid-with-three-tiers-and-over-50-web-2-for-massive-serp-movements-blasted-with-scrapebox
I don't know how this guy does it, but he provides 150+ web 2.0's on Fiverr. It's definitely not SENukeX. For 5 bucks, you can't complain too much.
Code:http://fiverr.com/users/chasegreen/gigs/create-a-link-pyramid-with-three-tiers-and-over-50-web-2-for-massive-serp-movements-blasted-with-scrapebox
there he says:
"at least 8 Web 2.0's of PR 3-8 for a total of 150+ Web 2.0 accounts"
i think its 150 profiles in web 2.0 sites