How to find One Way link for your client to post a link on that website?

I have quation for SEO Expert. I know how to build One way link for your website. You do Article, DIR, social bookmarking submisison etc…
But when some ask you to find out the links with PR 3 or 4 where they can post there links for some money, Know there i face some problem.
What will be the best way to find out the links for your clients.
Know my client ask me to find out the links **payday loans, cash advance, credit cards, phramacy, adult, gambling, casino. Page must be cached within last 30 days, PR (of page link is on) PR1+ and an Alexa below 4mil. **

Know my question is what steps do i need to do to find the links for my clients. Usuallt i do search visits different forums etc… which is very time taking. So i there any other way to find the links.

I suggest you read this page in Google Webmaster Tools Help, in particular the bit that reads:

Buying or selling links that pass PageRank is in violation of Google’s Webmaster Guidelines and can negatively impact a site’s ranking in search results.

Thanks for your suggestion. But i still looking for links so i can post link

What you are looking for may be better suited for a Private Blog network. After the assault on Public blog networks last month or so, I’m not sure where you can find a private network that easliy.