Ask HN: Where do I go to buy a CREDIBLE web business worth $100k?

I'm a little confused by your question. Are you looking to spend $100K or to generate $100K annually? If the latter, the company is probably "worth" 2 to 5 times $100K.

either is okay as far as numbers are good and i dont have to spend lots of time ... if the purchase price is $100k then i expect it to make around $5k/month.

You want to pay $100k and generate $60k/year without spending much time? I'll take 3.

I hope this doesn't sound condescending because I'm very, very far from an expert in this field, but you might want to spend some time researching conventional methods of business valuation. I'm pretty sure your expectations are a little off here.

http://37signals.com/svn/posts/2899-sortfolio-deserves-a-bet...

You could try SitePoint as well, they have a marketplace for selling sites.

http://sitepoint.com/