Hi Janeth,
I have never really found it neccessary to purchase links for my clients so it's kind of hard to answer the $$ part of your question.
My best guess is that a link on a PR7 or PR8 page with just 4 or 5 external links on it would at least boost a PR5 to a PR6. It would partly depend on how high the PR5 actually is before getting the link.
In early September, I secured a PR8 home page link (with 6 other external links on the page) to a PR4 home page. This was a no-money deal. In exchange for the PR8 link, my client bartered a link on all 82 pages of her site (most pages were PR3). After the next PR update, the home page was PR6 and the internal pages were mostly PR5s except for a couple of PR4s.
Several pages jumped from oblivion into the top-10 for some good keywords and traffic tripled. I believe this was mainly due to great anchor text in the link on the PR8 page.
The site did receive 7 or 8 other links during that time period, but nothing really special.
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